W3230 DC 12V 20A LED Digital Temperature Controller Thermostat Thermometer Temperature Control Switch Sensor Meter（DV12V）） Color:DC 12V They can help you test

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it is active if the vaule is 0V

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W3230 DC 12V 20A LED Digital Temperature Controller Thermostat Thermometer Temperature Control Switch Sensor Meter（DV12V）） Color:DC 12V They can help you testW3230 DC 12V 20A LED Digital Temperature Controller Thermostat Thermometer Temperature Control Switch Sensor MeterDV12V W3230 Description: Mini temperature controller. With clear LED display for better readability. Wide temperature measuring range. Heating or cooling control. All parameters setting can be saved after short circuit. Relay output. High Control precision 0. 1 centigradeCan be used for domestic freezer, water tanks, refrigerator,