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The W1209 Temperature Controller is a compact and efficient digital thermostat module designed for precise temperature control in various applications. It features an onboard microcontroller that allows users to set target temperature ranges with high accuracy. The module supports both heating and cooling modes, making it versatile for incubators, temperature-sensitive storage, and home automation projects. With a built-in relay, it can directly control electrical devices such as fans and heaters. The bright digital display ensures easy monitoring, while the waterproof NTC thermistor sensor provides reliable temperature readings. Designed for 12V DC operation, it is energy-efficient and easy to install. The W1209 offers programmable hysteresis settings for custom temperature control, ensuring stable and precise thermal management. Widely used in aquariums, greenhouse automation, and refrigeration systems, this controller is an essential tool for maintaining optimal temperature conditions.