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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
Input power: 12V DC
Temperature range: −50 to 110°C
Accuracy: ±0.1°C
Control resolution: 0.1°C
Refresh rate: 0.5 s
Relay output: 10A, normally open (closes above set point)
Hysteresis: 2°C (re-opens 2°C below set point)
Sensor: Waterproof NTC 10K (0.5%) probe (included)
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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 ...
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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.
- DC
- DC means direct current, where electricity flows in one constant direction, as supplied by batteries, USB ports and many plug-pack power supplies. When a product specifies DC, it runs from a DC supply rather than mains AC, so you need to provide the correct voltage and polarity.
- LED
- A light-emitting diode (LED) is a small electronic component that emits light when current flows through it in the correct direction. Because it only conducts one way, its polarity matters, and a through-hole LED must be soldered the correct way around to light up.
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