For Calibrates thermometers, temperature controllers and other temperature instruments against a factory certified thermometer traceable to NIST standards. Verifies accuracy of routine thermometers. For temperatures between ambient to 200°C (-30°C with the use of circulated refrigerated coolant). Digital temperature control with temperature uniformity of +/-0.02°C. Built-in ice bath for performing ice point calibrations. Meets the requirements of NBS Monograph 150