CALIBRATOR Features:  For calibrating non-contact infrared thermometers up to 500° C ( 932° F)  Temperature controlled black-body target with a diameter of 2.25 " ( 57mm)  Wide field of view to compensate for optical variations in individual infrared thermometers Fixed emissivity of 0.95 Simply set the desired temperature in increments of 0.1° , wait for the calibrator to attain equilibrium, point the infrared thermometer at the target, and measure the radiated energy Contact RTD reference well is located directly behind the blackbody target to assure even higher accuracies of ± 0.1° C Specifications: Temperature Range: 50 to 500° C ( 122 to 932° F) . Resolution: 0.1° C ( 0.1° F) . Accuracy: ± 0.8° C ( ± 1.6° F) :  100° C ( 212° F) ; ± 1.6° C ( ± 3.2° F) : 100 to  200° C ( 212 to 392° F) ; ± 2.8° C ( ± 5.6° F) : 200 to  500° C ( 392 to  932° F) . Stability: ± 0.1° C ( ± 0.2° F) :  100° C ( 212° F) ; ± 0.2° C ( ± 0.4° F) : 100 to  350° C ( 212 to 662° F) ; ± 0.4° C ( ± 0.8° F) : 350 to  500° C ( 662 to  932° F) . Target Emissivity: Fixed at 0.95. Cooling Time: 45 minutes to 100° C ( 122° F) . Heating Time: 40 minutes to maximum. Aperture Diameter: 57mm. Power Supply: 220VAC ( ± 10% ) , 1.25A/ 110VAC ( ± 10% ) , 2.5A. Dimensions: 180 x 114 x 233mm. Weight: 3 kg.