The Model 4500 Series Ultra-High Accuracy Thermometer takes metrology-level temperature measurement to the laboratory, the production floor and the field.

Ultra-high system accuracy is achieved because the thermometer and probe function as if they were calibrated together as a system even though they can be purchased separately.

​The Techne Secondary Standard Probes offer proven and reliable performance for your critical temperature measurements. It can be used with the Tecal Accu-Temp high accuracy digital thermometer or any comparable unit.

​The measuring element consists of two, welded-together, metal tapes. The tapes have different coefficients of thermal expansion. The coiled measuring element is fixed at the end of the stem; the other side being connected to the pointer axle. 

The measuring principle is based on the volumetric temperature expansion of the gas filling in the measuring element. The measuring element is firmly connected by a capillary tube with a measuring spring. The spring transfers the expansion of the gas filling by a movement on a dial.

The Martel BetaProbe TI / TI+ Digital Thermometers can replace many liquid-in-glass thermometers and also serve as a reference standard for other types of digital or analog temperature indicators. In addition, the intrinsically safe certification means it can be used virtually anywhere.