W1209 Digital Temperature Controller DC12V

Dimensions: approx. 48.5 × 40 × 15.8 mm (1.9 × 1.57 × 0.62 in); weight: lightweight plastic housing. Operating temperature range: -10°C to +60°C ambient; controlled temperature range: -50°C to +110°C. Measurement resolution: 0.1°C between -9.9°C and 99.9°C, 1°C elsewhere. Control and hysteresis accuracy: ±0.1°C. Refresh rate: 0.5 seconds. Powered by DC12V input; standby current ≤35mA, activation current ≤65mA; relay output rated for DC12V switching. Uses a 10KΩ ±0.5% waterproof temperature sensor for reliable thermal feedback. Suitable for indoor use in environments with 20–85% relative humidity. The module delivers precise, real-time digital temperature monitoring and automatic on/off control via built-in relay—no external driver needed. The LED display clearly shows both current temperature and setpoint simultaneously, enabling intuitive adjustment using three tactile buttons. Hysteresis setting prevents rapid cycling, extending equipment lifespan and improving stability. Designed for integration into diverse thermal management applications: greenhouse climate control, small-scale aquaculture tanks, fermentation chambers, laboratory incubators, DIY fridge/freezer mods, and water heater safety cutoffs. Its compact size and screw-terminal interface simplify mounting and wiring inside enclosures, cabinets, or custom-built rigs.