1 unit seldom use portable Blackbody Calibration Source without manual, covering the range from 0 to 150 degC with 0.1 degC resolution. The thermoelectric heating / cooling mechanism is utilized to achieve a compact and easy to use blackbody source. Source temperature is closely controlled by a self-tuning PID controller which displays temperature in a digital readout. Any queries, contact brich@singnet.com.sg