The HD 2107.1 & HD 2107.2 are protable instruments with a large LCD Display. They measure the temperature using PT100 or PT1000 immersion, penetration, contact or air probes. the sensor can be a PT100 3 or 4 wires, PT1000, Ni1000, Ni1000 or NTC2 wires. The probes are fitted with an automatic detection module, with the factory calibration setting already being memorized inside.