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A kit to make a general purpose thermostat with NTC temperature sensor. Temperature range +5°C to +30°C approx. (+41°F to +86°F approx.) Output relay with LED indicator Relay power rating 24V AC/DC 3A Suitable for beginners Dimensions 54(L) x 62(W)mm x 28(D)mm Velleman MK138 Requires 12V DC power supply 100mA (not included) - see Power supplies section.