Sangamo are a UK manufacturer of time clocks/heating controls, thermostats, immersion controllers & programmers. The brand is also recognised for their Round Pattern Time Switches. CHPRSTATF - Tamperproof Electronic Frost Thermostat  Tamper Resistant Cover with Security Torx Screw Large Temperature Adjustment Dial Call for Heat Indication LED Electronic Sensor fo Accurate and Responsive Performance -5°C to 30°C Set Temperature Range 0.5°C and 1°C Temperature Swing Adjustment 10A Switch Rating, 230VAC Energy Efficiency; ErP Class 4, 2% Value Operating Temperature: -5°C to 50° Material: ABS Dimensions: 86mm x 88mm x 38mm