Used for calibrating long distance infrared thermometer, which are designed with light weight as handhold and small calibrators. It is easily certify IR pyrometers to 600°C with large 2.25" (57 mm) blackbody target. Resistance thermometer detectors reference well for high precision whether you’re using in-line or handheld infrared pyrometers. For even higher precision, a contact calibration well is located directly behind the blackbody surface. Using an optional digital RTD (Resistance Temperature Detector) thermometer and calibrated secondary probe, accuracies of ±0.1ºC can be achieved.