Standard Platinum Resistance Stik Digital Thermometer Fixed-point Devices for Temperature Scale Realization The TP-0380L/S is an industrial standard thermometer designed by MPTest to replace traditional mercury thermometers. It features a digital direct-reading display with a range of 80 °C (-112°F) to 300℃ (572°F), available in long-stem and short-stem versions, with an accuracy of ±0.05 °C (±0.09°F)/year. Within the ITS-90, the temperature values of both the water triple point and the mercury triple point are realized using precision liquid (water or alcohol) bath. The Kelvin temperature corresponding to liquid nitrogen is 77 K (-196°C ). While it is not a defining fixed point on the ITS-90 scale, it is very close to the argon triple point temperature (-189.3442°C ) and is commonly used for the calibration of low-grade standard platinum resistance thermometers (SPRTs). These thermostats feature a temperature control stability of ±0.002 °C (32°F) and can achieve low temperatures down to -42 ℃(107.6 °F). Error adjustment functions for standard thermometers are passwordprotected. TP-0420 The TP-0420 is a rod-type standard platinum resistance thermometer developed by MPTest in compliance with the ITS-90 standard, featuring a digital direct-reading display. Mr. Minfeng Pan The founder of the company MPTest is founded by Mr. Minfeng Pan who is a leading expert in temperature metrology and calibration equipment with over 40 years of industry experience. In 1996, he established his first company in China, specializing in the innovative development and manufacturing of temperature calibration instruments and devices. During this time, he invented the patented precision thermostatic bath jet stirring technology, which led to the creation of compact, portable, precise, and low-noise products. These products are equipped with the company's self-developed precision temperature controllers, effectively improving temperature stability within small-medium fluid systems. This enables his company to deliver high-precision, highly stable portable temperature standards and superior thermostatic baths. Over the past 30 years, Mr. Pan and the innovative R&D team he led have designed more than 50 products and accessories. Their work has resulted in a unique and highly systematic product line for the company. @ Email: [email protected] The MPtest system requires only 10 liters of liquid nitrogen to complete the comparison calibration of nearly 20 secondary standard SPRTs. More importantly, in general operation, it typically requires no refilling of liquid nitrogen, and the thermometers are not damaged by being frozen in ice. The bath has a depth of 520 mm(20.47 in) and weighs approximately 40 kg(88lbs). It features a working diameter of 138 mm(5.43 in) and is cooled by a single-stage refrigerator. It includes a rechargeable battery with USB Type-C charging and data transfer interface. The adjustable omnidirectional viewing angle enhances readability. It offers largecapacity data storage (1GB) and direct Excel export functionality. As a temperature standard, it is traceable to ITS-90 fixed points. It is divided into temperature zones per ITS-90, with a common range of 189 °C (-308.2°F) to 419℃ (786.2°F), available in long-stem and short-stem versions, with an accuracy of ±0.025 °C (±0.045°F)/year. Notably, our realization apparatus for the aluminum freezing-point cell incorporates a metallic bath design. It includes a rechargeable battery with USB Type-C charging and data transfer interface. The adjustable omnidirectional viewing angle enhances readability. It offers largecapacity data storage and direct Excel export functionality. Furthermore, it can function as an ultra-low temperature bath and maintain stability at any set point below -80 °C. It is also capable of temperature control below 0 °C; however, this operating mode consumes liquid nitrogen rapidly and requires frequent refilling. This key feature effectively suppresses overheating, thereby ensuring the protection and integrity of the precious fixed-point cell. @ Email: [email protected] It is equipped with a buoyancy level indicator, allowing the user to easily monitor the current liquid level in the Dewar. Compared to a liquid nitrogen comparator, a temperature-controlled liquid nitrogen comparator can regulate the bath temperature at or above the argon triple point (-189.3442 °C), thereby preventing the liquefaction of the protective gas inside standard platinum resistance thermometers (SPRTs), which may occur when they are operated below the argon triple point. Mptest specializes in the manufacture of fixed-point cells for the realization of temperatures as defined by the ITS-90. Our product range encompasses fixed points including: aluminum, zinc, tin, indium, and gallium melting points; water, mercury, and argon triple points; as well as liquid-nitrogen-cooled lowtemperature comparators. Error adjustment functions for standard thermometers are passwordprotected. Liquid Nitrogen Comparators @ Email: info@mptestusa.

Calibration Baths for Temperature Laboratory Resistance Standards The so-called -80 °C constant temperature baths typically use high-purity alcohol as the medium because lower temperatures would increase the kinematic viscosity of alcohol, resulting in unsatisfactory temperature control stability. The MPtest low-temperature bath can achieve a technical specification of stable temperature control at -90 °C in ambient temperatures of up to 30 °C, though it requires the use of industrial alcohol instead of high-purity alcohol. Furthermore, MPtest incorporates unique jet-stream agitation technology...