W1209 Digital thermostat Temperature Control Switch 12V DC With Waterproof NTC Sensor
Review: 5 - "A masterpiece of literature" by John Doe, written onMay 4, 20020

W1209 Digital thermostat Temperature Control Switch 12V DC With Waterproof NTC Sensor

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  • Product SKU: KG079
₹ 109 ₹ 399
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The W1209 is a low-cost digital temperature control module commonly used for various applications like controlling temperature in small enclosures, aquariums, incubators, and more. It comes with a built-in microcontroller and a digital display. The module is often used as a simple thermostat to control a heating or cooling element based on the temperature sensed by an NTC (Negative Temperature Coefficient) thermistor sensor.

Components and their features

Digital Display

The module usually has a digital display (7-segment LED) that shows the current temperature. It might also display other information such as the relay status, etc

Temperature Sensor (NTC Thermistor):

The module includes a waterproof NTC thermistor sensor. An NTC thermistor is a type of resistor whose resistance decreases as its temperature increases. The sensor is typically attached to the module with a cable and can be placed in the environment where you want to measure the temperature.

Control Relay

The module is equipped with a relay that can be configured to turn on or off based on the temperature readings. This relay can be connected to a heating or cooling device (like a heater or a fan) to maintain the desired temperature.

Buttons and Settings

There are usually buttons on the module for setting the desired temperature and configuring other parameters like hysteresis (the temperature difference between turning the relay on and off) and temperature unit (Celsius ).

Power Supply

The module typically operates on a 12V DC power supply. This makes it compatible with a wide range of power sources.


You can set a target temperature using the buttons on the module. The relay will activate when the sensed temperature crosses a certain threshold, either above or below the set temperature, depending on the heating or cooling configuration. Once the temperature stabilizes within the desired range, the relay will switch off.

Physical Attributes

  • Dimensions (mm) L x W x H: 48 x 40 x 15
  • Weight (gm): 21

Technical Details

  • Model: W1209
  • 7 Segment Display Color: Red
  • Control Range(°C) : -50 to +110
  • Control Precision(°C) : 0.1
  • Measuring Input: NTC10K Sensor
  • High-Temperature Alarm(°C) : -50 to +110
  • Input Voltage (V): 12
  • Output Type: Relay Output 29A (max)
  • Return Difference Setting(°C) : 0.1 to 30
  • Delay Starting(min) : 0 to 10
  • Temperature Calibration(°C) : -10 to 10

    Product Video


    Package Includes

    • 1 x W1209 Digital thermostat Temperature Control Switch 12V DC With Waterproof NTC Sensor

    Customer Reviews

    Based on 19 reviews
    Such an amazing controller

    I'm so happy with this product.Intuitive installation!Great case. (That was unexpected) and so precise;If you are planing a project just buy this!It works perfectly!!!Congrats to this seller and the designer of this little device

    ravinder @ bacchi
    Easy to use and seems reliable

    Inexpensive, easy to use and generally pretty nice little controllers.

    nanku prasad
    Great value

    Great and user friendly relay

    Using these units for vent controls, works great

    Although it registers in Celsius, easy to convert. takes its own power PLUS acts as a pass-thru relay. Very easy to use.

    gaurav shankar
    Great product, easy to use and install

    Easy to use

    device and case easy to use

    the temperature in Fahrenheit would have been better

    hare chatiyan
    Great item need better instructions or videos in English.

    Great item thanks and God Bless.

    Worked perfect!

    Worked great for RV anti freeze idea.

    jatin @ sonu
    It works.

    I use one of these to control the heat in a 3d printer enclosure. Works great!

    ajay narayan
    great little device

    It turns on the fans for the cabinet I keep my amp in. Nice little solution.