For precision temperature sensing, nothing beats a Platinum RTD. Resistance temperature detectors (RTDs) are temperature sensors that contain a resistor that changes resistance value as its temperature changes, basically a kind of thermistor. In this sensor, the resistor is actually a small strip of Platinum with a resistance of 100 ohms at 0°C, thus the name PT100. Compared to most NTC/PTC thermistors, the PT type of RTD is much most stable and precise (but also more expensive) PT100's have been used for many years to measure temperature in laboratory and industrial processes, and have developed a reputation for accuracy (better than thermocouples), repeatability, and stability.
This high-temperature PT100 sensor is equipped with an stainless steel shield is good for up to 550°C.
Stainless steel tube: 4mm diameter by ~30mm long (size of stainless steel capsule may vary!) Cable is approx 1m / 100cm long Contains a PT100 temperature sensor Three wires with terminal prong ends PT100 technical specs:Usable temperature range: -200 to 550°C (-328°F to +1,022°F) Uses 3-wire interface ±0.5°C Accuracy from -10°C to +85°C Product Weight: 19.3g / 0.7oz