What is a Standard Platinum Resistance Thermometer?

Why Use an SPRT?
An SPRT is capable of making temperature measurements to a much higher accuracy than other types of resistance thermometer. Measurement uncertainties can be less than 0.001°C.

What Temperature Range can an SPRT be used over?
Whilst the ITS-90 specifies -189°C to 962°C there a range of ‘sub ranges’ and it is common for different models of SPRTs to be used over smaller temperature ranges, all ranges pass through 0.01°C.

Are SPRTs better than Industrial PRTs, do I need one?
SPRTs are specialist devices, they may well be too fragile, or too expensive for your application – or an SPRT might be the only way to achieve a particular accuracy or measurement uncertainty.