• W1209 12V DC digital thermostat temperature controller shown assembled in its clear acrylic case.
  • Top-down view of the W1209 thermostat module PCB, showing the relay, display, and green terminal block.
  • The waterproof NTC temperature sensor probe for the W1209 thermostat.
  • An annotated image of the W1209 thermostat pointing out the digital display, relay, and sensor interface.
  • Temperature control board with digital display and thermocouple on a white background
  • Electronic temperature control board with digital display on a white background
  • The DIY clear acrylic case for the W1209 thermostat, shown in pieces with screws and nuts.
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W1209 12V DC Digital Thermostat Temperature Controller Switch with Case

W1209 12V DC Digital Thermostat Temperature Controller Switch with Case

HK$45.00
HK$45.00
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Delivery Options

  • Local delivery within Hong Kong and in-store pickup.​
  • Free shipping for orders of HK$400 or above; HK$35 shipping fee for orders below HK$400.​
  • Shipped by SF Express, usually dispatched the same day for orders confirmed before 6:00 PM (Mon–Sat).​
  • Estimated delivery time: 1–3 business days after dispatch (Hong Kong).​
  • In-store pickup details (location and time) will be confirmed by email or phone message.​
  • Delivery times are estimates and may be affected by weather or unforeseen circumstances.​

W1209 12V DC Digital Thermostat with Case

Take precise control of your environment with the W1209 Digital Thermostat Controller. This versatile 12V module is perfect for a huge range of DIY projects, allowing you to automatically manage heating or cooling systems with ease. It features a clear 3-digit display (available in red or blue) and comes with a protective DIY acrylic case.

Key Features

  • Clear Digital Display: Bright 3-digit LED screen shows the current temperature and settings.
  • Heating & Cooling Modes: Fully programmable (P0 setting) to control either a heater or a cooling device.
  • High-Precision Control: Features a 0.1°C control accuracy with a wide temperature range of -50°C to 110°C.
  • Waterproof Sensor: Includes a high-accuracy NTC (10K 0.5%) waterproof temperature probe.
  • Adjustable Settings: Fine-tune your control with settings for hysteresis (P1), temperature limits (P2, P3), calibration (P4), and delay start (P5).
  • Protective Case: Comes with a DIY clear acrylic case kit to protect the module from dust and accidental contact.

Common Applications

This controller is the perfect solution for:

  • Aquariums and fish tanks
  • Incubators for eggs or reptiles
  • Homebrewing (fermentation control)
  • Pet enclosures (heating pads, heat lamps)
  • Refrigerators or freezers
  • Computer server or component cooling
  • Any DIY project requiring temperature automation

Simple Setup & Programming

  • Set Target Temperature: Press the "SET" button. The display will flash. Use the "+" and "-" buttons to select your desired temperature, then press "SET" again to confirm.
  • Access Settings Menu: Press and hold "SET" for 5 seconds to enter the parameter menu (P0-P6).
    • P0: Cooling (C) / Heating (H)
    • P1: Hysteresis / Return Difference (0.1-15°C)
    • P2: Upper Temperature Limit
    • P3: Lower Temperature Limit
    • P4: Temperature Correction/Calibration
    • P5: Delay Start Time (0-10 minutes)

Specifications

  • Model: W1209
  • Operating Voltage: DC 12V
  • Temperature Range: -50°C to 110°C
  • Control Accuracy: 0.1°C
  • Sensor Type: NTC (10K 0.5%) Waterproof Probe
  • Relay Output Capacity: 10A (max) @ 277V AC / 10A (max) @ 30V DC
  • Module Dimensions: 48.5mm x 39.8mm x 14.9mm
  • Case Dimensions (Assembled): 59.3mm x 50.3mm x 14.5mm
  • Total Weight: ~44g

 

What's Included

  • 1 x W1209 Digital Thermostat Module
  • 1 x NTC Waterproof Temperature Sensor
  • 1 x DIY Clear Acrylic Case Kit (with screws and standoffs)
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