Relay output interface is a switch, when it working ,these two ports are connected. W1209 Digital temperature thermostat - Systems 10A Relay Temperature Switch W1209 Digital Temperature Controller Thermostat Module With Display And Waterproof Temperature Sensor 50 To 110°C Temperature Control Aazon.co: Haldzeo W1209 Teperature Controller odule DC12V LED... Environmental requirements: -10 ~ 60 ℃ ，Humidity 20% -85%. The W1209 is a highly functional 12V DC digital thermostat temperature controller designed to regulate temperatures between -50∘C and 110∘C . It features an onboard relay to switch heating or cooling devices, a 3-digit LED display, and a waterproof NTC temperature sensor, allowing for precise temperature regulation with 0.1°C resolution Temperature range :-50-110 ℃.
