CALsys 1200BB calibration source is a highly stable standard Black Body Furnace for calibrating non contact IR thermometer for the wide temperature range of 300 to 1200°C. The unique feature of this Black Body Furnace is large temperature controlled black body target with a diameter of 40 mm which offer large view area for IR Thermometer.The Emissivity of the target is 0.99(±0.01).The temperature of the calibrator is set and controlled by a self tuned PID controller with automatic super fine adjustment.