Description: Resistance temperature detectors (RTDs) are temperature sensors that contain a resistor that changes resistance value as temperature changes, basically a kind of thermistor. In this sensor, the resistor is actually a small strip of with a resistance of 100 ohms at 0C, thus the name PT100. Compared to most NTC/PTC thermistors, the PT type of RTD is much most stable and precise ( 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 ( thermocouples), repeatability, and stability. Ours RTD Sensor Amplifier with the MAX31865 breakout for use with any 2, 3 or 4 wire PT100 RTD The MAX31865 handles all of your RTD needs, and can even compensate 3 or 4 wire RTDs for better accuracy. Connect to it with any microcontroller over SPI and read out the resistance ratio from the internal . We put a 430 0.1% resistor as a reference resistor on the breakout. We have some example code that will calculate the temperature based on the resistance . We even made the breakout 5V compliant, with a 3.3V regulator and level shifting, so you can use it with any for For or microcontroller. Also comes with two 2-pin terminal blocks (for connecting to the RTD sensor) and pin header (to plug into any breadboard or perfboard). note: this does not include an RTD sensor Color: purple Material: PCB Package Contents: 1 x MAX31865 Temperature Sensor Module 2 x 2-pin terminal blocks 1 x pin 1 x PT100 cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.