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)