5698-25 Working Standard SPRT
The 5698-25 SPRT meets the ITS-90 ratio requirements for SPRTs and includes a Hart-designed, completely strain-free platinum sensor. With a 485 mm quartz sheath, this 25-ohm SPRT cover temperatures ranging from –200°C to 670°C. Long term drift is less than 6 mK, typically less than 3 mK.
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