A Pt100 is a sensor used to measure temperature. A PT100 temperature sensor is one type of sensor which falls into a group called Resistance Temperature Detectors or RTDs, it has a resistance of 100 ohms (Ω). Pt in Pt100 refers to sensor is made from Platinum (Pt) and 100 refers to that at 0°C sensor has a resistance of 100 ohms (Ω).

Specification:

Type : Head Type PT100, Simplex
Probe diameter: 6 mm
Probe Length : 10 inch
1/2" BSP Fitting