The PT100 RTD (Resistance Temperature Detector) is a highly accurate, PTC temperature probe. It uses a thin strip of pure platinum that has a resistance of 100Ω at 0°C (±0.15°C) and 138.51Ω at 100°C (±0.35°C), thus providing a ~0.385Ω change per °C. The 3 wire version has one wire connected to one end of the platinum strip and two wires on the other end; this is to compensate for the voltage drop from the wires.

Specifications:
Temperature range: -50°C to 200°C
Dimensions: 4mm x 100mm