Rainbow ts series adjustable capillary thermostats rainbow ts 120s r this 0c to 120c adjustable capillary temperature probe functions as a thermostat by measuring the difference between internal and external temperature due to expanding liquid ideal for applications such as electric cooker deep fat fryers commercial refrigerators cold storage facilities water heaters fan heaters etc rainbow ts 120s 0 to 120c 2 capillary thermostat with knob