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Nantong Diagnos Biotechnology Co., Ltd.

17 yrs·5.0
·Manufacturer/Factory & Trading Company
Main Products:
Rapid Test Kits, Diagnostic Test Kit, Malaria Test Strips, Antigen Test, HIV Test Kit, Drug Test, Ovulation Test Kit, Malaria Antigen Test, Pregnancy Tests, H Pylori Test
Country/Region:
Jiangsu, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
Nantong Diagnos Biotechnology Co., Ltd. - Pioneering Excellence in Medical Innovation Since 200.

TAIZHOU EBPU PRECISION INSTRUMENTS CO., LTD.

Main Products:
Metallographic Sample Preparation Machine, Ultrasonic Flaw Detector, Surface Roughness Tester, Thickness Meter, Metallurgical Microscope, Brinell Hardness Testing Machine, Vickers Hardness Testing Equipment, Shore Durometer, Portable Leeb Rebound Hardness Test Equipment, Rockwell Hardness Tester
Country/Region:
Zhejiang, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
Located in the beautiful coastal city of Wenling, Zhejiang, EBPu Electromechanical Equipment (Zhejiang) Co., Ltd. is a key private enterprise in Wenling's high technology industries. We are committed to becoming the most satisfied supplier to our partners & clients! EBP's mission is provide one-stop testing solutions to customers and make test more easier! We providing our users with innovative & robust full lab-solutions, reliable service, support & access to the knowledge that comes from our team serving the industry for 10+ years.

Tianjin Harvest High Pressure Pump Co., Ltd.

15 yrs
·Manufacturer/Factory & Trading Company
Main Products:
High Pressure Pump, High Pressure Pump Washer, High Pressure Plunger Pump, High Pressure Pump Cleaning Equipment, Water Jet Machine
Country/Region:
Tianjin, China
R&D Capacity:
OEM/ODM Service
Company Profile:
Tianjin Harvest High Pressure Pump Co., Ltd. Is a leading manufacturer of industrial high pressure water jetting equipment, specialized in high pressure triplex plunger pump. Backed by strong technical support and after-sales service, we offer a complete line of pump units, jet guns, hoses, nozzles and optional parts. Positive displacement pump branch of national pumps member of the unit Pressure range meets the requirements of most clients across applications in all industries.

MEGAJET(CHONGQING)TECHNOLOGY CO.,LTD

4 yrs
·Manufacturer/Factory & Trading Company
Main Products:
High pressure cleaning equipment products
Country/Region:
Chongqing, China
R&D Capacity:
OEM/ODM Service
Company Profile:
Chongqing jiemeng environmental technology Co., Ltd. is a leading supplier of innovative waterblasting solutions for a wide range of applications including - industrial cleaning, surface preparation,

Dst (Shenzhen) Sensor Co., Ltd.

8 yrs·5.0
·Manufacturer/Factory & Trading Company
Main Products:
Motor Test Bench, Torque Sensor, Load Cell, Multi Axial Force Sensor, Weigh Modul,Force Sensor
Country/Region:
Guangdong, China
R&D Capacity:
ODM Service
Sample Service:
Sample Available
Company Profile:
Dst (Shenzhen) Sensor Co., Ltd. (hereinafter referred to as "DECENT") was established on 2018. It is a high- tech enterprise focusing on mechanical measurement and control, force measuring product R & D, applied technology research, production, manufacturing and sales. Mainly engaged in motor test bench, force sensors, torque sensors, multi- dimensional force sensors, display control instruments and weig modul solutions. Products are widely used in goods weighing, industrial automation, 3 C product test bench, biomechanical simulation, motor reducer dynamometer and other industries. The company now has five research directions: Weighing division, torque division, multidimensional force division, instrument division and piezoelectric division. The company has a leadership team that is good at innovation and dare to challenge itself! A group of pragmatic and diligent technical team with good professional quality! Desente is rooted in Shenzhen, the manufacturing capital of the world, and serves intelligent manufacturing, the trendsetter of industrial reform. Desente is determined to become a respected world brand of force measuring sensors. At present, our products are exported to more than 40 countries around the world, and the product quality is unanimously recognized and praised by users. We sincerely welcome customers and friends all over the world to order our products and become partners with us. We will provide you with timely, efficient and professional services. Welcome to contact us and look forward to cooperating with you!

Dongguan HOOHA electrical machinery company Limited

Main Products:
Wire Drawing Machine, Annealing and Tinning Machine, Cable Extrusion Machine, Cable Twisting Machine, Cable Bunching Machine, Tubular Stranding Machine, Rigid Frame Stranding Machine, Pay off and Take up Machine, Testing Machine, Copper Cable Equipment
Country/Region:
Guangdong, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
HOOHA Introduction

Guangdong Guangce Instrument Technology Co., Ltd.

11 yrs·5.0
·Manufacturer/Factory & Trading Company
Main Products:
Testing Equipment, Polymer Material Test Machine, Mechanical Test Machine, Environmental Test Chamber, Flammability Test Machine
Country/Region:
Guangdong, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
Guangdong Guangce Instrument Technology Company Limited, located in Dongguan City, is a technology-based private enterprise engaged in research and development, production, OEM and sales of scientific and technological equipment manufacturing. Our company has 15 years of production experience, has various software and hardware design and research and development capabilities, and also have experienced and high-quality technical team and professional sales team. GuangCe's main business includes plastic physical properties, mechanics, environmental reliability, aging, and flame retardant testing instruments, among which the annual output of plastic polymer physical properties testing instruments ranks among the top in the country. And our products comply with GB, ASTM, ISO, JIS, EN, DIN, UL and other testing standard.

TIANJIN GRAND METAL CO., LTD.

12 yrs·5.0
·Trading Company
Main Products:
Nails Wires
Country/Region:
Tianjin, China
Sample Service:
Sample Available
Company Profile:
TIANJIN GRAND METAL CO. Ltd. Is a specialized manufacturer of steel with research-manufacture-distribution system together, developed into a big manufacture and exporter of steel wire and nails.

Pufa Special Materials (Tianjin) Co., Ltd

Main Products:
Mold & Tool Steel (P20 718h H13 D2 S1 O1), Spring Flat Steel (En45A Sup9 60si2mn 5160), Alloy Steel Bars (4140 4340 42CrMo 40cr), Carbon Steel Plates (Ss400 S235jr S355jr), Ship Plate Steel (Ah36 Dh36 Eh36 ABS/BV/Dnv), Stainless Steel Plates (304 316L 310S 321), Stainless Steel Pipes (Smls & ERW Sch 10s-80s), Nickel Base Alloys (Inconel 600 Hastelloy C276), Wear Resistant Steel (Nm360 Nm400 Ar400 Ar500), Galvanized & Cold Rolled Steel (SPHC SPCC Coils)
Country/Region:
Tianjin, China
R&D Capacity:
OEM Service
Sample Service:
Sample Available
Company Profile:
Pufa Special Materials (Tianjin) Co., Ltd. is a leading supplier and exporter of specialty steels, focusing on Alloy Steel, Tool Steel, Spring Steel, and Wear-resistant Steel. With over [10] years of experience in the steel industry, we serve global clients in Automotive, Mold Manufacturing, Mining, and Shipbuilding. We pride ourselves on strict quality control and stable supply chains, ensuring that every ton of steel meets international standards.

Shenzhen Fger Electromechanical Equipment Co., Ltd.

19 yrs
·Manufacturer/Factory & Trading Company
Main Products:
Sheet Metal Casing, Communication Chassis Housing, Integrated System Control Console Housing, Intelligent Self-service Terminal Casing, Medical Equipment Cabinet Housing
Country/Region:
Guangdong, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
Our company offers variety of products which can meet your multifarious demands. We adhere to the management principles of "quality first, customer first and credit-based" since the establishment of the company and always do our best to satisfy potential needs of our customers. Our company is sincerely willing to cooperate with enterprises from all over the world in order to realize a win-win situation since the trend of economic globalization has developed with anirresistible force.

Dongguan Lan Dun mechanical and electrical equipment Technology Co., Ltd.

15 yrs
·Manufacturer/Factory & Trading Company
Main Products:
UV Curing Machine, UV Lamps
Country/Region:
Guangdong, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
Dongguan Landun Electromechanical Equipment Technology Co., Ltd. is a company specializing in UV curing equipment for more than ten years. The company is located at No. 10 Wusha Xing 2ND Road, Chang'an Town, Dongguan City. The company is a global professional manufacturer of UV curing equipment integrating R& D, production and sales. More than 50 employees, nearly 100 sets of advanced production equipment. A large number of engineering and technical management personnel at all levels have gathered nearly 30 people. The company covers an area of 5, 000 square meters. The total construction area is 3, 000 square meters. "Blue Shield Electromechanical" constantly improves the reserve of talents according to the needs of the market, technological innovation, and the concept of after-sales service. Connected to the "2025 China Zhizhi" strategy grand blueprint.

Henan Tiandajigao Molecular Materials Technology Co., Ltd.

7 yrs
·Manufacturer/Factory
Main Products:
TPO Ridge Flashing, TPO Waterproof Membrane, PVC Waterproof Membrane, HDPE Waterproof Membrane, EPDM Waterproof Membrane, TPO Composite Roof Tile
Country/Region:
Henan, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
TianDa Waterproof, a leading enterprise in the polymer waterproofing membraneindustry, holds controlling stakes in TianDa Waterproof Building Materials Co., Ltd., TianDaHexahedral Building Technology Co., Ltd., and Henan TianDa Ji Polymer MaterialsTechnology Co., Ltd. Recognized as a high-tech enterprise and a specialized, refined, distinctive, and innovative (SRDl) company, it serves as the vice president unit of the HenanBuilding Waterproofing Association. In 2019, the company participated in the national JingJin-Ji industrial transfer project and established a waterproof building materials production

HangZhou Testsea biotechnology Co., Ltd.

11 yrs·5.0
·Manufacturer/Factory & Trading Company
Main Products:
Infectious Disease Rapid Test, Drug of Abuse Rapid Test, Animals Diagnostic Rapid Test, Hormone Rapid Test, Tumor Markers Rapid Test, Cardiac Markers Rapid Test, Food Safety Rapid Test, Reagents and Original Material, Medical Machine, Women Health Test Seriese
Country/Region:
Zhejiang, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
Founded in 2015 with the pursuit "serving society, health world"focusing onthe R&D, production, development, sales and service of In Vitro diagnostic products and veterinary products.

Henan Junmu Medical Equipment Co., Ltd.

Main Products:
Vertical Pressure Steam Sterilizer
Country/Region:
Henan, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
Henan Junmu Medical Equipment Co., Ltd. is a leading manufacturer of sterilization and freeze-drying equipment with over 20 years of industry experience. Our sterilization solution ensures optimal safety and efficiency across a wide range of industries, including the medical, pharmaceutical, laboratory, food, and edible mushroom industries. The main products include vertical high-pressure sterilizers, horizontal high-pressure sterilizers, portable high-pressure sterilizers, plasma sterilizers, ethylene oxide sterilizers, freeze dryers, laboratory instruments, etc. Our products are highly trusted by hospitals, laboratories, and mushroom farms worldwide.

Guangzhou Herun Bio-Pharm Co., Ltd.

Main Products:
Human Rapid Test, Vet Rapid Test, Immunofluorescence Analyzer and Test Kit
Country/Region:
Guangdong, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
Guangzhou Herun Biopharm Co., Ltd. is a high-tech enterprise focused on animal in vitro diagnostic (IVD) materials and point-of-care testing (POCT) diagnostic reagents. We prioritize "technological innovation and people-oriented" principles, providing quality diagnostic products and solutions for global customers, promoting sustainable development in animal and human health.

HANGZHOU EVEGEN BIOTECH CO., LTD.

10 yrs
·Manufacturer/Factory & Trading Company
Main Products:
Rapid Diagnostic Test, Veterinary Test Kit, Canine Rapid Test, Feline Rapid Test, Swine Rapid Test, Bovine Rapid Test, Ovine Rapid Test, Equine Rapid Test, Wild Animal Rapid Test, Poultry Rapid Test
Country/Region:
Zhejiang, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
HANGZHOU EVEGEN BIOTECH Co., Ltd. is an emerging technology-based enterprise integrating R& D and production of rapid test for pet and animal diseases. The company with professional R& D Team that has been in the business for more than 10 years. And cooperated with international well-known animal diagnostic reagent teams to develop markets in the Mediterranean, Southeast Asia and South America and become a well-known brand of veterinary rapid test in the Philippines.

Evancare Medical ( Nantong) Co., Ltd.

8 yrs
·Trading Company
Main Products:
Rapid Test; Urine Analysis Test Strips; Disposable Laboratory Items
Country/Region:
Jiangsu, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
EVANCARE MEDICAL (NANTONG) Co., Ltd was located in the beautiful city, NANTONG Jiangsu Province, near Yangtze River and Yellow Sea, which is adjacent to Shanghai of China. We are a famous& professional manufacturer and supplier for rapid test kit for more than 15 years with certificates of CE mark, US FDA, ISO 13485, ISO 9001, Australia TGA, Germany Bfarm and so on.

Huichao Medical (Lianyungang) Co., Ltd

8 yrs·4.5
·Trading Company
Main Products:
Test Kit
Country/Region:
Jiangsu, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
Lianyungang Huichao Medical Co., Ltd which is one of the largest companies in the "China Top 500 List". We are mainly engaged in the R&D, Manufacture and Distribution of Finished Drugs, Bulk Pharmaceuticals, and Intermediates & Chemicals. Our commodities are being exported to more than 60 countries and regions around the world, trusted by customers from the globe. We are an excellent company involved in many fields, and have improved our management system by ISO9001 system and endeavored to approach to the international advanced level. Since we were founded, we have constantly devoted to establishing business innovation, industrialization and brand. Based on our business, we have built own manufacture plants for Finished Drugs, Bulk Pharmaceuticals, and Intermediates & Chemicals. Also we have established a R&D Centre which possesses advanced equipments and experienced experts. We have constantly emphasized on the business core of "to establish the strategic alliance partnerships with up-and-down-stream customers from all over the world". Therefore, we have achieved a high reputation in the field of pharmaceuticals, chemicals, agrochemicals by offering top quality and personalized services to our customers. "Client satisfaction is our responsibility". We should be your best partner in Pharmaceutical and Chemical business.

Dongguan Mingrui Technology Co., Ltd.

Main Products:
SMT Line, DIP Line, Printer, X-ray, PCB Conveyor, Laser Marking, Wave Soldering Machine, Pick and Place, Reflow Oven, Coating Machine
Country/Region:
Guangdong, China
R&D Capacity:
OEM/ODM Service
Company Profile:
We are a supplier from China, we are located in Building 8, Hanyuan Huajian Digital Intelligent Manufacturing Park, No. 232, Hongtu Road, Nancheng District, Dongguan City, Guangdong Province. As an electronic equipment solution provider, GDMR is a highly influential partner in the global electronics manufacturing sector, providing entire factory equipment solutions across the whole value chain. We have more than 15 years experience in electronics manufacturing, providing customers demand analysis, program planning, production equipment, training services, production operations, process optimization, process adjustment and other related plant operation elements, covering manufacturing process in semiconductor, PCBA, SMT, DIP, Coating, Robot, Assembly and others. GDMR provides one-stop solutions and helps customers at different stages to build, upgrade, optimize and adjust their manufacturing systems from 0 to 1.

Jiangsu Wellhead Drilling Equipment Co., Ltd.

18 yrs·5.0
·Manufacturer/Factory & Trading Company
Main Products:
Gate Valve, Choke Valve, BOP, Wellhead and X-mas Tree, Choke and Kill Manifold
Country/Region:
Jiangsu, China
R&D Capacity:
OEM/ODM Service
Company Profile:
Jiangsu Wellhead Drilling Equipment Co., Ltd. is a professional manufacturer and exporter for gate valves, wellhead, casing head, tubing head, X-mas tree, kill and choke manifold, and BOP.

Nine Steel Industrial (Tianjin) Co., Ltd.

5 yrs
·Manufacturer/Factory & Trading Company
Main Products:
Photovoltaic Bracket, Anti-Seismic Bracket, Photovoltaic Accessories, I Beam, Steel Pipe, Steel Plate, Steel Coil, Decking Sheet, Insulation Panel
Country/Region:
Tianjin, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
The company has always focused on the production of cold-formed steel sections (including C-section, Z-section, U-section, M-section, angle steel, and special-shaped profiles), solar mounting systems and their accessories (ground mounting systems, roof mounting systems, waterproof solar mounting systems, adjustable mounting systems, tracking systems, automatic cleaning systems, etc. ). We also provide agency services for hot-DIP galvanizing and installation!

Xinjiang Likang Xiangyun Biotechnology Co.,Ltd.

11 yrs·5.0
·Manufacturer/Factory & Trading Company
Main Products:
Medical Instrument, Hearing Aids, ECG Machine, Blood Pressure Moitor, Glucometer, Medical Consumables, Nebulizer, Wound Dressing, Infusion Pump
Country/Region:
Xinjiang, China
R&D Capacity:
ODM Service
Sample Service:
Sample Available
Company Profile:
Founded in 1995, Likang started from the distribution of domestic iVD reagents, and gradually developed in the medical industry chain. In 2017, we started the production of a full series of biochemical reagents, and in 2018, we established our biochemical research & development laboratory, and successfully developed LK-001 antibody. Starting SPD services and international trade business in 2023.

Zhejiang Ruizhao Technology Co., Ltd.

16 yrs
·Manufacturer/Factory & Trading Company
Main Products:
Flange Bolt; Press Screw; Wheel Bolt; U Nut; Wheel Nut
Country/Region:
Zhejiang, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
ZheJiang RuiZhao Technology Co., Ltd (SNLON) is one of largest fasteners manufacturer s in Wenzhou city China since 1996. Whose main products are Flange Bolt, Socket Screw, Press Screw, Step Screw, Wheel Nut, Wheel bolt, Flange Nuts, Circlip. Clip nut. Precision CNC parts, and Automotive Fasteners

Dongguan Zhicheng Instrument Co., Ltd.

7 yrs
·Manufacturer/Factory & Trading Company
Main Products:
Environmental Test Chamber, Temperature Humidity Chamber, Thermal Shock Test Chamber, Temperature Aging Testing Chambers, Rapid Temperature Change Chamber, Climate Test Chamber.
Country/Region:
Guangdong, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
Dongguan Zhicheng Instrument Co., Ltd., located in Dongguan, the shining pearl of China's manufacturing industry, is a high-tech enterprise that leads the way in the field of environmental simulation testing equipment. Since its establishment, we have always adhered to the core philosophy of "quality first, customer first" and are committed to providing excellent quality and efficient environmental testing solutions to global customers.

Shanghai GLOMRO Industrial CO., LTD.

10 yrs
·Trading Company
Main Products:
Spray Dryer Machine, Particle Size Analyzer, Oxygen Bomb Calorimeter, Spot Cooler, Tensile Strength Testing Machine, Explosion Proof Air Conditioner, Tga, DSC, Differential Scanning Calorimeter, Air L
Country/Region:
Shanghai, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
Shanghai Glomro Industrial Co., Ltd was founded in 2012. Specializing in the production of thermal analysis machine, laboratory instrument, analytical instrument, testing equipment, industrial measurements and instruments products. Products of high quality, fashionable, widely used in a variety of industrial areas, not only has the broad masses of the domestic sales market, but also exported to Europe and the United States. Glomro hinge over the years has always adhered to "quality of products in order to survive, credibility and development services" business purposes. Committed to providing you with high-quality products and quality services. Have a professional, dedicated design management team, from product design, mold making, molding to the Product assembly, for each aspect and processes are rigorously testing and control. Over the past few years of production and management and exploration, we set up our own quality management system. Industry standards including SAE, IEC JEDEC, ASTM and MIL-STD, ISO: 9001, UL, CE certified. Glomro always implement the concept of customer value creation for customers tailored products to meet the needs of different customers, and continuously provide customers with solutions to technical problems, further exploration innovation, and excellence. We can provide customers with professional and prompt pre-sales, MID-sales, and after-sales support. Warmly welcome you and opening up the boundaries of communication. We synchronize with your ideal partne

Biobase Meihua Trading Co., Ltd.

15 yrs
·Manufacturer/Factory & Trading Company
Main Products:
Autoclave, Chemistry analyzer, Laminar Flow Cabinet, Lab Incubator, Medical Freezer, Spectrophotometer, Centrifuge, Biosafety Cabinet
Country/Region:
Shandong, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
Our factory is BIOBASE, which founded in 1999, BIOBASE is a professional manufacturer whose business covers laboratory equipment, medical device, engineering project and cosmetics. With more than 3, 000 employees, 25+ factories, BIOBASE has establishedOverseas branches in USA, UAE, Singapore, Kazakhstan, India, MyanmarAnd other countries. BIOBASE has long-term business partners in 190+ countries. BIOBASE can provide one-stop solutions for laboratory and medical fields. Main products include biological safety cabinet, laminar flow cabinet, Fume hood, refrigerator & freezer, autoclave, oven, incubator, centrifuge, Wheel chair, hospital bed, IVD instrument, clean room project, etc. BIOBASE has certificates including ISO9001, ISO13485, ISO14001, ISO45001, EN12469, CE, etc. BIOBASE would like to establish win-win business cooperation withDistributors all over the world.

Xiamen Tmax Battery Equipments Limited

5.0
Main Products:
Battery Lab Equipment Line, Battery Production Equipment Line, Battery Pack Assembly Line, Li Ion Battery Materials, Laboratory Equipment, Lithium Battery Making Machine, Polymer Battery Assembly Machine, Cylindrical Battery Assembly Machine
Country/Region:
Fujian, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
Xiamen Tmax Battery Equipments Limited was set up as a manufacturer in 1995, dealing with lithium battery equipments, technology, etc. We have total manufacturing facilities of around 200000 square foot and more than 230 staff. Owning a group of experie-nced engineers and staffs, we can bring you not only reliable products and technology, but also excellent services and real value you will expect and enjoy.

Shanghai Linbel Instrument Co., Ltd.

5.0
Main Products:
Heating and Cooling Device, Thermostatic Water Bath, Recirculating Chiller, Glycol Chiller, Alcohol Chiller, Jacketed Glass Reactor, Rotary Evaporator, Short Path Distillation
Country/Region:
Shanghai, China
R&D Capacity:
OEM/ODM Service
Sample Service:
Sample Available
Company Profile:
Shanghai Linbel Instrument Co., Ltd. is a professional manufacturer focusing on the development, production and sales of teaching instruments. It mainly produces organic synthesis devices, rotary evaporators, double-layer glass reactors, micro melting point measuring instruments, circulating water multi-purpose vacuum pumps, glass instrument airflow dryers, low temperature coolant circulating pumps, stainless steel heat collecting magnetic stirrers, ultrasonic cleaners Electric blast drying oven, stainless steel electric heating plate, intelligent glass constant temperature water bath, water tank, vacuum drying oven, desktop high-speed centrifuge, digital display constant temperature electric heating jacket, DC constant speed mixer, heating magnetic mixer, cast iron electric furnace, digital temperature controller, lifting table, ultra-fine homogenizer, high shear dispersion emulsifying machine, high and low temperature circulating device and other models of teaching instruments.