Pt100 sensors are the most common type of platinum resistance thermometer . ... 100 refers to that at 0°C sensors has a resistance of 100 ohms (Ω). A resistance thermometer is a type of temperature sensor. It consists of an element that uses resistance to measure temperature. Features: Ceramic measuring resistors 1 x Pt100, wire-wound Built into stainless tube W.St.1.4571, electro-polished 3-wire connection Meets IEC 751 Although declared as class B, most meet the requirements of class A (±0.15 °C @ 0 °C) Factory tested with SCS calibrated measuring equipment Specifications: Type Resistance Sensor Temperature Measuring Range Min . 0 °C Temperature Measuring Range Max . 300 °C Accuracy 0.15°C Thermometer Output Type Pt100 Lead Length 2 m Probe Length 100 mm Housing Material Stainless Steel Package Includes: 1 x  Resistance Sensor PT100