The W1209 Digital Thermostat Controller is a compact, lowcost switch with a clear acrylic housing. It uses the included precision remote sensor to sense temperature and automatically power connected equipment to maintain the desired setpoint. Benefits at a glance Simple, reliable temperature control: maintains an on/off temperature to keep heaters, coolers, or fans within range. Flexible wiring: relay contacts for easy power connection to diverse devices and setups. Easy setup: no programming knowledge required; three tactile switches, onboard microcontroller, and a clear display to configure the trigger temperature. Adjustable and readable: plus/minus controls let you set the precise on/off thresholds; current temperature and status are shown on the display. Compact, durable design: small form factor in a clear acrylic housing suitable for tight spaces and DIY projects. Sensor included: compatible with the precision remote temperature sensor provided in the package. 2–3 practical use scenarios Home fermentation or incubation: keep the fermentation or culture temperature stable within a narrow range. Small refrigeration, incubator, or seedling box: regulate temperature for storage or cultivation. DIY cooling/heating projects: drive a fan, heater, or cooler in cabinets, enclosures, or small rooms. Notes Relaybased control for straightforward wiring to standard power circuits. Includes remote sensor for accurate temperature readings.