RTD (Resistance Temperature Detector) – a temperature sensor whose resistance changes with temperature PRT (Platinum Resistance Thermometer) – RTD using platinum wire for the resistance element Pt1000 – PRT with 1,000 Ohm at 0 °C. Pt500 – PRT with 500 Ohm at 0 °C. Pt100 – PRT with 100 Ohm at 0 °C. Pt25 – PRT with 25 Ohm at 0 °C. Pt10 – PRT with 10 Ohm at 0 °C. SPRT (Standard PRT) - high-stability PRT designed for use as a reference thermometer