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ITS-90 extended the use of the platinum thermometer from 630°C to 962°C. The 0.25-ohm HTPRT sensor uses a strip-shaped support made from high-purity quartz glass. The 2.5-ohm model uses a quartz glass cross frame. Stability after thermal cycling is excellent, and the design is reasonably tolerant of vibration. Choose from 0.25-ohm or 2.5-ohm nominal RTPW values. In addition to meeting the resistance ratio requirements shown above, these thermometers meet the following additional criterion: W (1234.93 K) 4.2844 After all, this really is about W!