EXTECH 433201 Temperature Calibrator, to2498 Degrees F. More details: Handheld Temperature Calibrator, Measurement Functions Temperature and Voltage, Thermocouple Type J, K, T, C, E, N, R and S, Thermocouple Temperature Range -184 Degrees to 2498 Degrees F (-120 Degrees to 1370 Degrees C) (Dependent of Thermocouple Type), Source Voltage -5mV to 55mVDC, Voltage Measurement Range -5mV to 55mVDC, Accuracy +/-0.15 Percent of Reading +/-1 Degree, Display 4 Digit LED, Powered By 9V Rechargable NiCd Battery