This instrument is mainly used to monitor the temperature of liquid in a glass vessel and temperature of vapour of reflux divider in a typical glass distillation unit.

The instrument consists of a Temperature indicator and two Resistance temperature detectors (RTDs). The instrument works on 230V, 50Hz power supply. This displays the temperature in degree Centigrades in three and half digits of 12.5mm character height. A switch is provided to see the two temperatures alternatively.