Dual function CA20 Thermocouple Calibrator can be used to source Type J thermocouple output values or measure Type J thermocouples. Quickly select output value using the rotary switch with coarse and fine adjustments. Model CA20 accepts up to two Type J thermocouples and features data hold and max functions. Measurements are displayed in a 3-1/2 digit backlit display. Units include a 4" (100 mm) Type J bead wire temperature probe, calibration cable, 9V battery and instruction manual.