This 12V precision temperature controller is a compact, panel‑mount thermostat module that measures temperature using the included waterproof 10K NTC probe and switches a connected load via its built‑in 10A relay. It’s ideal when you need simple on/off control of a heater or cooler (not PID), with a clear 3‑digit LED readout for live temperature and set‑point programming.
The relay is normally open and closes when the measured temperature rises above the set point, then re‑opens 2°C below the set point (fixed hysteresis). That behaviour makes it well‑suited to over‑temperature cut‑in/venting, fan control, or basic heating control where a small deadband is acceptable and you want to avoid relay chatter.
Compatibility notes: it requires a 12V DC supply (not AC, not 5V), and the relay is a simple on/off switch rated up to 10A—appropriate for low‑voltage DC loads and many mains loads if correctly wired and safely enclosed, but it’s not designed for high inrush/inductive loads without additional protection. The included sensor is an NTC 10K (0.5%) probe; if you replace it, you’ll want the same type/value to maintain correct readings.
Practical uses include fermentation/fridge fan control, terrariums/incubators, small heated enclosures (including 3D printer enclosures), and general temperature monitoring with automatic switching. If you need tighter control (minimising overshoot) or ramp/soak profiles, a PID controller would be a better fit; if you just need straightforward threshold switching, this module is the simpler/cheaper option.
Key Features
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Little Bird
12V Precision Temperature Controller with 3 digit display 10Amp Relay
This compact 12V temperature controller features a 3-digit LED display for setting and monitoring temperature, along with a built-in 10A relay for switching ...
This compact 12V temperature controller features a 3-digit LED display for setting and monitoring temperature, along with a built-in 10A relay for switching heating or cooling loads. It uses an NTC thermistor probe (included) for measurement across a wide range of −50 to 110°C.
The relay operates as normally open and closes when the measured temperature rises above the set point. It re-opens once the temperature falls 2°C below the set point, providing built-in hysteresis to prevent rapid relay cycling.
Key Features
- 3-Digit LED Display – Shows current temperature and set-point during configuration
- 10A Relay Output – Normally open, switches at the set temperature with 2°C hysteresis
- Wide Measurement Range – −50 to 110°C with ±0.1°C accuracy
- Waterproof NTC Probe – 10K (0.5%) sensor included for reliable temperature sensing
- Panel-Mount Design – Compact module fits a 46 × 26.5 mm panel cutout
Specifications
- Input Power – 12V DC
- Temperature Range – −50 to 110°C
- Accuracy – ±0.1°C
- Control Resolution – 0.1°C
- Refresh Rate – 0.5 s
- High-Temperature Protection – 0 to 110°C
- Sensor – NTC 10K (0.5%), waterproof
- Static Current – ≤35 mA
- Relay Active Current – ≤65 mA
- Operating Environment – −10 to 60°C, 20–85% humidity
- Module Size – 48.5 × 40.1 × 15.8 mm
- Panel Cutout – 46 × 26.5 mm
- Weight – 22.3 g
Ideal For
- Homebrew and fermentation temperature control
- Incubator and terrarium heating systems
- 3D printer heated bed or enclosure regulation
- Aquarium and hydroponic temperature monitoring
Package Contents
- 1× 12V Temperature Controller Module
- 1× Waterproof NTC Temperature Probe
Jargon buster
Plain-language definitions for the technical terms used above.
- LED
- A light-emitting diode is a small electronic component that lights up when current flows through it in the correct direction. In this kit, LEDs create the flashing effect, so polarity and correct soldering matter for the project to work.
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