HomeSupplier Discoveryarrow-rightInstruments & Metersarrow-rightTest Machinearrow-rightTop Testing Instruments Factories & Companies
Filter
Category
More
Management Certification
More
R&D Capacity
Annual Revenue
More
No.of Employees
More
Province & Region
More
about top testing instruments
  • Technological Innovation
  • Reliable Supply Chains
  • Substantial Manufacturing Capabilities

top testing instruments3,000+ factories verified

Wuhan Goldhome Hipot Electrical Co., Ltd.

5.0
Main Products:
AC Resonant Test System, AC/DC Hipot Tester, Circuit Breaker Analyzer, Hv Test Set, Power Frequency Hipot Tester, Transformer Tester, AC Dielectric Test Set, Partial Discharge Test Set, High Voltage Test Set, Primary Current Injection Test Set
Country/Region:
Hubei, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
Wuhan Goldhome Hipot Electrical Co., Ltd was established in 2008, with the double efforts to struggle under more than ten years' diligent hard-working and adhere to spirit of keeping truth-seeking and pragmatic, exploring one professional road with competitive development in the electric and power testing field.

Dongguan Lituo Testing Instrument Co., Ltd.

18 yrs
·Manufacturer/Factory & Trading Company
Main Products:
Testing Instrument
Country/Region:
Guangdong, China
R&D Capacity:
OEM/ODM Service
Company Profile:
Dongguan Lituo Testing Instrument Co., Ltd. is a manufacturing enterprise integrating R&D, production and sales of various materials and finished product properties, mechanics and environmental testing instruments. The company is located in Houjie Town, Dongguan, Guangdong, covering an area of 10, 000 square meters. After years of development, it has successively passed ISO 9001 CERTIFIED, SGS Approved Supplier Certificate, Environmental management system certification, Intellectual property management system certification, Occupational health and safety management system certification, etc. We have a professional foreign trade team, can respond in time, provide customers with professional and efficient service and reasonable prices, We also have strong research and development capabilities to improve the quality and usability of our products for our customers.

Hebei Dual Canopy Mechanic Electrical Engineering Co., Ltd.

2 yrs
·Manufacturer/Factory & Trading Company
Main Products:
Transformer Test Series, Transformer Oil test series, SF6 Test Series, Insulation resistance tester, Relay protection tester, High Voltage Test Series, Power Quality Analyzer, Circuit Breaker Test, Pa
Country/Region:
Hebei, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
Hebei Dual Canopy Mechanic Electrical Engineering Co., Ltd. - Enhanced Company Profile

Jinan Hengfeng Electrical Technology Co., Ltd

3 yrs·5.0
·Manufacturer/Factory & Trading Company
Main Products:
Tan Delta Teser, VLF Hipot Test System, DC Hipot Tester, Insulation Resistance Tester, Surge Arrester Leakage Current Analyzer
Country/Region:
Shandong, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
Hengfeng Electric power equipment(Jinan) Co., Ltd is established in year of 2006, located at Jinan city, Shandong province, China. Hengfeng Electric is a professional manufacturer engaged in the research development production, sale and service of electric power systems.

Zhejiang Yante Scientific Instrument Co., Ltd.

6 yrs
·Manufacturer/Factory & Trading Company
Main Products:
Box Compression Tester, Vertical Tensile Tester, Brightness and Color Tester
Country/Region:
Zhejiang, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
Hangzhou Yante Science and Technology Co., Ltd, is a high-tech enterprise in Hangzhou, Zhejiang, and it is mainly dealing with the R & D, manufacturing and marketing of various intelligent instrumentation used in packing, paper-making, printing, textile, cigarette, electromechanical and other industries. In addition, we act as an agent of some advanced testing devices from abroad. Relying on our team made up of top technical engineers and managerial elites and the joint-stock system and thanks to our people-oriented operation and top quality management, we are advancing and pioneering constantly.

Kvtester Electronics Technology Co., Ltd.

18 yrs
·Manufacturer/Factory & Trading Company
Main Products:
CT and PT Analyzer, HV Testing Equipment, Transformer Tester, Relay Protective Tester, Generator and AMP Tester, Earthing Tester, and HV and AMP Tester, AC Resonant Equipment, Cable Fault Locator System, Circuit Break Tester, Substation Online Monitoring System
Country/Region:
Hubei, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
Our company is specialized in high voltage test equipment, power measurement and test equipment and instrumentation, substation online monitoring system and related software products R & D, design, production, sales and service.

Wuhan Hertz Power Equipment Co., Ltd

9 yrs·5.0
·Manufacturer/Factory & Trading Company
Main Products:
Power Safety Apparatus Test Equipment, Power Transformer Test Equipment, High Voltage Switch Test Equipment, Relay Protection Test Equipment, Transformer Test Equipment, Zinc Oxide Lightning Arrester Test Equipment, Cable Test Equipment, Sf6 Gas Oil Analysis Equipment, Storage Battery Test Equipment, Insulation Resistance Test Equipment
Country/Region:
Hubei, China
R&D Capacity:
ODM Service
Company Profile:
Wuhan Hertz Electric Power Equipment Co., Ltd. Was established in 2017. The company originated from a team of senior engineers from Wuhan High Voltage Institute and professors from Huazhong University of Science and Technology, formed in 1993. The company primarily focuses on the research and development of power testing equipment such as lightning impulse generators, partial discharge test devices, high current temperature rise systems, transformer comprehensive test systems, switchgear comprehensive test systems, and motor comprehensive test systems. It also extends its services to shielding room design and installation, grounding design, and construction, offering a comprehensive service platform. Currently, the company boasts two major bases: The Optics Valley Electromechanical Industry Park production and testing base, and the Science and Innovation Center office and R&D base.

Chongqing TOP Oil Purifier Co., Ltd.

14 yrs
·Manufacturer/Factory & Trading Company
Main Products:
Oil Purifier Machine; Petroleum Tester; Electrical instrument; Road Bituminous Tester; Chromatograph; Spectrometer; Carbon Black Tester; Coal Tester; lron Core Loss Tester; Diffractometer
Country/Region:
Chongqing, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
Located at Chongqing city--a southwest electromechanical manufacturing center as well as national municipality, Chongqing TOP is a professional leading manufacturer and supplier of oil purifiers and various related testers. We consists of departments respectively for technological development, machinery manufacture, instrument manufacture, quality control etc. On basis of mature development and manufacture technology and highly qualified production management team, the products own high quality, easy operation, excellent performance and lone service life.

Zhejiang Top Cloud-Agri Technology Co., Ltd.

19 yrs
·Manufacturer/Factory & Trading Company
Main Products:
General Laboratory Equipment, Agriculture Equipment, Testing Equipment, Tools, Software and Hardware of Agriculture Informatization and Internet of Things
Country/Region:
Zhejiang, China
R&D Capacity:
OEM/ODM Service
Company Profile:
TOP Cloud-agri was found on 2008 with registered capital amount US$ 9.84 million. It located at Hangzhou, Zhejiang Province of China. It is a national high-tech enterprise which is specialized in design, development, manufacture, and sales of agriculture testing instrument, laboratory equipment, smart agriculture solutions for more than 16 years. The core products of the company are testing instrument in seed shape measurement, seed breeding, sampling, cleaning, storage, seed vigor and health research, plant physiology, soil physical properties analysis, crops quality analysis, food safety detection, agriculture produce quality testing, plant protection, pest forecast and monitoring, weather monitoring, water quality detection, smart agriculture solutions, and other general laboratory devices. No requirement about MOQ, OEM is accepted, and it provides 18months warranty of products.

Chongqing Gold Mechanical & Electrical Equipment Co., Ltd.

4.0
Main Products:
Oil Purifier, Fire Testing Equipment, Petroleum Products Testing Equipment, Electrical Testing Equipment, Transformer Test Set, Oil Test Kit, Fire Retardant Test, Cone Calorimeter, Bdv Tester, Flash Point Tester
Country/Region:
Chongqing, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
Chongqing Gold Mechanical & Electrical Equipment Co., Ltd is a high-tech enterprise for researching, designing, developing and producing scientific and measuring instruments. With its continuous drawing of lessonas, unremitting innovation and borrowing of advanced technology from both at home and abroad, our company is now becoming a professional manufacture of oil tester, electric tester, fire testing equipment, and oil purifier.

CHANGSHA LANGSHUO TECHNOLOGY CO LTD

7 yrs·5.0
·Trading Company
Main Products:
Universal Tensile tester, Ink Proofers, environment chamber,Contact Angle Testers, plastic tester, Vibration Meter, Video Measuring Machine,Viscometer,Densimeter,XRF analyzer
Country/Region:
Hunan, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
CHANGSHA LONROY TECHNOLOGY Co., Ltd is professional in manufacturing and selling kinds of test equipments with high technology and high accuracy. The headquarters is located in Dongguan, Guangdong Province. Changsha Lonroy is proessional in Printing, Ink, Packaging, Paint Coating test equipments, and also sell other industry test machines.

Xi'an Zealchon Electronic Technology Co., Ltd.

5.0
Main Products:
Testing Machine, Xrf Gold Testing Machine, Bitumen Testing Machine, Asphalt Testing Machine, Soil Lab Testing Machine, Geotechnical Testing Equipment, Civil Engieering Testing Equipment, Driling Fuilds Testing Equipment, Retroreflectometer Road Marking, Static Penetration Test
Country/Region:
Shaanxi, China
R&D Capacity:
OEM Service
Sample Service:
Sample Available
Company Profile:
With more than 18 years of civil engineering background, Zealchon is engaged in manufacturing and supplying qualitative array of research and laboratory testing equipment. Our range includes research lab Instruments, soil testing instruments, bitumen testing instruments, and Cement & concrete testing equipment.

Shijiazhuang Casiting Trading Co., Ltd.

5.0
Main Products:
Steel and Iron Castings, Reinforced Concrete Pipe Pallet, Concrete Pole Making Machine, Concrete Culvert Pipe Making Machine, En877 Cast Iron Pipes Fittings, Stainless Steel Coupling, Intelligent Power Compensation Capacitor, Apf Ahf, Svg, Gas-Fired Hot Water Boiler
Country/Region:
Hebei, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
We are the Manufacturer and the Supplier of the following products, manufactured in China, and we are offering a Direct Supply of these products from our Factory:

Dongguan Xin Bao Instrument Co.,Ltd

18 yrs
·Manufacturer/Factory & Trading Company
Main Products:
Testing Machine, Test Chamber, Tensile Testing Machine, Climatic Chamber, Vibration Test Machine, Salt Spray Chamber, UV Aging Test Chamber, Dust Chamber, Drying Oven, Testing Equipment
Country/Region:
Guangdong, China
R&D Capacity:
ODM Service
Sample Service:
Sample Available
Company Profile:
Dongguan Xin Bao Instrument Co., Ltd with its own brand, OTS, has been dedicating in providing professional testing equipment with top quality since its establishment in 1978, It owns sophisticated and advanced technology in producing temperature and humidity chambers, climatic test chambers, environmental chambers, thermal shock test chambers, rain and dust test chambers, salt spray chambers, walk in /drive in test chambers and other customized test chambers, tensile testing machine, vibration test machine, Paper Packaging Testing Equipment, Luggage Testing Equipment, Furniture Testing Equipment, Leather and Shoes Testing Equipment, Mobile phone and PC Testing Equipment, Battery Testing Equipment, Plastic and Rubber Testing Equipment, Products made by OTS reach international standards: ISO, ASTM, DIN, EN, GB, BS, JIS, AMSI, UL, TAPPI, AATCC, IEC. They are also widely used in different area: R&D Institutions, Quality Inspection Institutions, Universities, electronics, communications, instrumentation, automobile, plastic, metal, Building materials, Aviation, etc.

Jinan Hensgrand Instrument Co., Ltd.

18 yrs
·Manufacturer/Factory & Trading Company
Main Products:
Testing Machine, Tensile Testing Machine, Universal Testing Machine, Impact Testing Machine, Fatigue Testing Machine, Metallographic Equipment, Hardness Tester
Country/Region:
Shandong, China
R&D Capacity:
ODM Service
Sample Service:
Sample Available
Company Profile:
JINAN HST Founded in 2009, it has gone through 15 eventful years. It is a high-tech enterprise with import and export rights. The company is committed to providing the market with professional and reliable material mechanics testing solutions, At present, the material testing system produced by the company successfully provides reliable mechanical testing solutions for the global aerospace, national defense, scientific research institutes, universities, engineering quality inspection, verification and certification, automotive and shipbuilding, rail transit, bridge civil, consumer electronics, textile, metallurgy, chemical, medical, electric power, import and export inspection and other industries. Our products are exported to Germany, the United States, Spain, Australia, Italy, South Africa, South Korea, Pakistan, Papua New Guinea, Malaysia, Thailand, Singapore and other international markets. We have a professional pre-sales, sales, after-sales service team, to provide strong technical support to users at home and abroad.

Dongguan Weixiang Machinery Co., Ltd.

Main Products:
Production-Type Two-Roll Mill, Production-Type Internal Mixer, Casting Film Machine, Blown Film Machine, Twin Screw Extrusion Granulation Line, Filter Testing Machine, Internal Mixer, Calendering Machine, Injection Molding Machine, Aging Machine
Country/Region:
Guangdong, China
R&D Capacity:
OEM/ODM Service
Company Profile:
Dongguan Weixiang Machinery Co., Ltd. - Your Premier Partner in Non-Metal Experimental Machinery

Hangzhou Suntech Machinery Co., Ltd.

Main Products:
Wire Drawing Machine, Heat Treatment Furnace, Galvanizing Equipment, Welding Wire Equipment, Extrusion Machine, Side Channel Blower, Wire Mesh Machine, Welding Electrode Equipment, Steel Fiber Making Machine, Annealing Furnace
Country/Region:
Zhejiang, China
R&D Capacity:
OEM Service
Sample Service:
Sample Available
Company Profile:
Hangzhou Suntech Machinery Co., Ltd., a provincial high-tech enterprise certified by Zhejiang Province, China, specializes in the R&D, manufacturing, and global export of advanced machinery for metal processing and industrial automation solutions. Established with a mission to drive innovation in the metalworking industry, we integrate cutting-edge technologies to deliver high-performance equipment tailored to diverse industrial demands.

Chongqing Rexon Oil Purification Co., Ltd.

Main Products:
Oil Purifier Machine, Oil Purification Machine, Oil Filtration System, Oil Filter, Vacuum Oil Purifier, Vacuum Oil Dehydation Plant, Transformer Oil Purifier, Transformer Oil Filter, Lube Oil Purifier, Hydraulic Oil Filtration Unit
Country/Region:
Chongqing, China
R&D Capacity:
OEM/ODM Service
Company Profile:
Chongqing Rexon Oil Purification Co., Ltd was built in year of 2006 and located in Chongqing city, China, which is a famous industrial machinery city. As a leading oil purifier manufacturer and oil purification technology development company, we specialized in designing, producing, developing and selling various types of oil purification equipment such as transformer oil purifier, turbine oil purifier, lube oil purifier, hydraulic oil purifier, engine oil purifier, ship oil filtration plant, used cooking oil purifier, centrifuge oil separation purifier and all other industrial oil purification machines. We offered professional oil solutions service and oil purifier machines for world-wide customers near 20 years. Our equipment can be applied to many industrial fields, such as the electric power, petroleum chemical, metallurgical industry, mine, aviation, shipping and railway, factories, and so on. We have sold products to Africa, North America, South America, Asian countries, worldwide places. And we have been to customers' on-site places to offer training and commissioning services for customers as required like Africa countries, Asian countries etc. From these years work for oil filtration and on-site oil processing, we gain rich experiences and researching in better machines and keep us developing all the time. We are aiming to save oil energy sources and save new oil cost for our customers, through purifying their old oil, and maintaining their oil cleanliness to keep their oil always in good condition as new to use into their machinery, equipment and system. And under this situation, these machinery and equipment can be always maintained well too, so their lifetime can be also prolonged largely.

SKZ International Co., Ltd.

5.0
Main Products:
Thermal Analysis, Water Quality Analyzer, Textile Testing, Pulp Testing, Rubber and Plastictesting, Density Meter, Electronic Balance, Gas Detector, Moisture Meter, Paper and Paperboard Testing
Country/Region:
Shandong, China
R&D Capacity:
OEM Service
Sample Service:
Sample Available
Company Profile:
SKZ Industrial Co., Limited and SKZ International Co., Limited are the members of SKZ group, We are specialized in supply Laboratory Instrument, Scientific instrument, Analytical Instrument, Thermal Analysis, Moisture meter, Gas detector and testing instruments for pulps, paper, cardboards, plastic, rubber and textile.

Jinan Chenji International Trade Co., Ltd.

Main Products:
Tensile Testing Machine, Hardness Tester, Plastic PVC Tester, Juicer, Beer Brewing Equipment, Ethanol Distilling Equipment, Beer Barrel, Railway Spring, Metallographic Cutting Equipment, Grinding Polishing Machine
Country/Region:
Shandong, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
Jinan Chenji International Trade Co Ltd was founded in the year of 2014. Our office located in Jinan City that is famous of the Spring Water all over the whole country. Client can arrive to visit us by the Jinan YaoQiang International Air Station.

GOLDSOL(WUHAN)HIPOT TEST EQUIPMENT FACTORY

5.0
Main Products:
Vlf Hipot Testers, AC Hipot Tester, DC Hipot Tester, Resonant Test Set, Micro Ohmmeter, Tan Delta Tester, Primary Current Injection, Secondary Current Injection, CT PT Analyzer, Circuit Breaker Analyzer
Country/Region:
Hubei, China
R&D Capacity:
OEM/ODM Service
Company Profile:
GOLDSOL(WUHAN) HIPOT TEST EQUIPMENT FACTORY

Chongqing Gold Mechanical & Electrical Equipment Co., Ltd.

17 yrs·5.0
·Manufacturer/Factory & Trading Company
Main Products:
Geophysical Equipment, Borehole Camera, Well Logging Equipment, Water Level meter ,Resistivity Meter, Seismic equipment, Magnetometer
Country/Region:
Chongqing, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
Chongqing Gold Mechanical & Electrical Equipment Co., Ltd is a high-tech enterprise for researching, designing, developing and producing scientific and measuring instruments. With its continuous drawing of lessonas, unremitting innovation and borrowing of advanced technology from both at home and abroad, our company is now becoming a professional manufacture of oil tester, electric tester, laboratory instrument, road building instrument and geophysical equipment.

Jinan Nake Test Equipment Co., Ltd.

Main Products:
Steel Strand Relaxation Testing Machine, Rock Testing Machine, Dynamic Fatigue Testing Machine, Impact Testing Machine, Tensile Testing Machine, Pressure Testing Machine, Bending Testing Machine, High Strength Bolt Torque Coefficient Tester, Torsion Testing Machine, Steel Strand Testing Machine
Country/Region:
Shandong, China
R&D Capacity:
OEM/ODM Service
Company Profile:
We are a specialized testing equipment manufacturer with more than 20 years of history. Our company is supported by over 20 industry experts dedicated to research and development. We have a workforce of more than 50 experienced production personnel and a professional after-sales service team of over 10 individuals. Our combined production and office facilities exceed 4000 square meters and are certified as a high-tech enterprise in China.

Better Technology Group Limited

Main Products:
Turnkey Solution for Battery Manufacturing, Battery Production Equipment, Automatic Battery Assembly Line, Lead Acid Battery, Lithium Battery, Portable Power Station, Solar Home Energy Storage Battery, Lithium Battery Designing and Manufacturing
Country/Region:
Fujian, China
R&D Capacity:
OEM Service
Sample Service:
Sample Available
Company Profile:
Better Technology Group Limited (hereinafter referred to as "Better Tech Group") is a well-known global operator of integrated solutions for battery manufacturing and has been delving deep into the markets of BRICS countries and countries along the Belt and Road Initiative for over a decade. Nowadays, Better Tech Group's business covers nearly 120 countries and regions worldwide. It has been actively practicing the corporate mission-"Let 'Made-in-China' beautify the world".

Xinxiang Unitfine Machinery Co., Ltd.

9 yrs
·Trading Company
Main Products:
Vibrating Screen, Vacuum Conveyor, Pulverizers, Tube Chain Conveyor, Drying Equipment, Mixers, Rotary Cone Mixer, Vacuum Tray Dryer, Ultrasonic Generator, Tumbler Sifter
Country/Region:
Henan, China
R&D Capacity:
OEM/ODM Service
Company Profile:
Unitfine machinery could be traced back to 1990s in designing and producing vibrating sieves, vibrating feeders, screw conveyor, etc related with powdered products processing, after years of keep growing we had become into a solution provider for powder processing, could undertake turnkey project as well as part of a whole production line with our own fabricated equipment and well subcontracting or outsourcing components. We are persistent to further prolong life, reduce weight, and simplify operations in order to achieve high efficiency, productivity, reliability, and lower carbon footprints.

HEBEI TUOSI MECHANICAL EQUIPMENT CO., LTD.

9 yrs
·Manufacturer/Factory & Trading Company
Main Products:
Tct Grinding Machine, Tct Saw Blade Grinding Machine, Band Saw Grinding Machine, Roter Bit Grinding Machine, CNC Grinding Machine, CNC Saw Blade Grinding Machine
Country/Region:
Hebei, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
Hebei Tuosi Machinery Equipment Co., Ltd. is located in Huatong Street (Chengda Glass Factory), Fengnan Economic and Technological Development Zone, Tangshan City, Hebei Province. The company covers an area of 12, 000 square meters with 5 production workshops. Founded in 2005, the company has been focusing on the production of CNC grinding machines for grinding variety of TCT circular saw blades for more than ten year, enjoys a high reputation in China, occupies about 30% market share in China, We sold about 400 macnhines in 2019

Shanghai Shengqian Industrial Co., Ltd.

Main Products:
Cup, Cuvette, Sample Cups, PCR Tube, Freeze Box, Petri Dish, Culture Flask, Pipette Tips
Country/Region:
Shanghai, China
Sample Service:
Sample Available
Company Profile:
Shanghai Shengqian Industry Co., Ltd. is a professional agent, sales of thrombus hemostatic products and medical instruments, and is committed to provide high quality products and a full range of technical services for domestic medical laboratory and research workers. And Anhui Shengqian Biotechnology Co., Ltd, which is a professional manufacturer for the medical consumables in the area of laboratory. Our products include coagulation series consumables, luminescence series consumables and molecular biology consumables.

Hualong Test Co., Ltd.

Main Products:
Universal Testing Machine, Tensile Testing Machine, Compression Testing Machine, Impact Testing Machine, Fiber Cable Testing Machine, Fatigue Testing Machine, Torsion Testing Machine, Bending Testing Machine, Steel Strand Testing Machine, Material Testing Machine
Country/Region:
Shanghai, China
R&D Capacity:
OEM/ODM Service
Company Profile:
HUALONG Test Instruments Co., Ltd., Established on May 8th, 1993, located in Shanghai, is one of the world's leading manufacturers of Material testing equipment.

Beijing GFUVE Electronics Co., Ltd.

Main Products:
Current Transformer, Energy Meter Calibration, Power Quality Analyzer, Test Equipment, CT PT Analyzer, Relay Test Equipment, Split Core Current Transformer, Current Probe, Voltage Transformer, Power Meter
Country/Region:
Beijing, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
Beijing GFUVE Electronics Co., Ltd. Was established in 2005. It combined science, industry and trade together as one high-tech enterprise. GFUVE mainly produces split core current transformer, high voltage ammeter recorder, IEC61850 test suite software, meter test equipment, current probe, reference standard meter, phantom load power source, electrical measurement instrument, relay test set, transformer test, CT analyzer, Test equipment, and power meter, power analyzer, intelligent digital meter, transducer, handheld terminal and split core current transformer, voltage transformer and current transformer models etc.