Black Body Source for Calibrating Infrared Thermometers from 50 to 500 Degree C. The B-500 Portable IR Calibrator is used for calibrating long distance Infrared Thermometers, which are designed as handheld and need small calibrations. Whether you’re using in-line or handheld infrared pyrometers, you need a high performance calibration standard to verify accuracy. The portable IR Calibrator provides a stable black body target for calibrating non-contact IR thermometers up to 500 Degree C. The portable IR calibrator features a large temperature-controlled blackbody target with a diameter of 2.25 Inch (57mm), which offers a wide field of view area for optical variations in IR thermometers. With an emissivity of 0.95, the isothermal target can be controlled in set-point increments of 0.1 Degree from 50 Degree C to 500 Degree C. For even higher precision, a contact calibration well is located directly behind the blackbody surface. Using an optional digital RTD thermometer and calibrated secondary probe, accuracies of 0.1 Degree C can be achieved.