The CS series modular calibrators provide a simple to use, cost-effective, on site/laboratory calibration system when supplied with the RT161 high precision reference thermometer. The CS172 Calibrator provides a temperature calibration source for contact and non contact thermometers from 40° C below ambient to + 75° C. The CS171 Calibrator provides a temperature calibration source for contact and non contact thermometers from +30° C to + 200° C. RT161 is a high precision reference thermometer with 0.01 resolution. Operates from a 9V PP3 battery or external 9V supply. Range -30.00 to + 199.99°C