---
product_id: 148776197
title: "HiLetgo 2pcs W1209 with Case 12V DC Digital Temperature Controller Board Micro Digital Thermostat -50-110°C Electronic Temperature Temp Control Module Switch with 10A One-Channel Relay and Waterproof"
brand: "hiletgo"
price: "€ 23.28"
currency: EUR
in_stock: true
reviews_count: 13
category: "Hi Letgo"
url: https://www.desertcart.be/products/148776197-hiletgo-2pcs-w1209-with-case-12v-dc-digital-temperature-controller
store_origin: BE
region: Belgium
---

# Waterproof sensor included Low power consumption MCU ±0.1°C ultra-precise control HiLetgo 2pcs W1209 with Case 12V DC Digital Temperature Controller Board Micro Digital Thermostat -50-110°C Electronic Temperature Temp Control Module Switch with 10A One-Channel Relay and Waterproof

**Brand:** hiletgo
**Price:** € 23.28
**Availability:** ✅ In Stock

## Summary

> 🌡️ Take control of your environment with pinpoint precision—because your projects deserve nothing less!

## Quick Answers

- **What is this?** HiLetgo 2pcs W1209 with Case 12V DC Digital Temperature Controller Board Micro Digital Thermostat -50-110°C Electronic Temperature Temp Control Module Switch with 10A One-Channel Relay and Waterproof by hiletgo
- **How much does it cost?** € 23.28 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.be](https://www.desertcart.be/products/148776197-hiletgo-2pcs-w1209-with-case-12v-dc-digital-temperature-controller)

## Best For

- hiletgo enthusiasts

## Why This Product

- Trusted hiletgo brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Built to Last, Built to Perform:** Wave soldered, stable, and tested for consistent reliability under demanding conditions.
- • **Versatile & Ready for High Loads:** 10A relay output supports a wide range of high-power devices, from AC units to custom cooling fans.
- • **Precision that Powers Your Projects:** Experience razor-sharp temperature control with 0.1°C accuracy—perfect for critical environments and DIY pros.
- • **Smart Memory for Seamless Operation:** Embedded MCU with EEPROM remembers your settings even after power loss—no need to reset, ever.
- • **Plug-and-Play with Waterproof Confidence:** Comes with a rugged waterproof sensor and protective case—ideal for humid or industrial setups.

## Overview

The HiLetgo W1209 Digital Temperature Controller is a compact, 12V DC thermostat module featuring ultra-precise 0.1°C control accuracy, a low-power embedded MCU with memory retention, and a robust 10A relay output. It includes a waterproof sensor and protective case, making it ideal for applications requiring reliable temperature regulation from -50°C to 110°C. Tested for stability and consistency, this controller is perfect for DIY enthusiasts and professionals managing HVAC, cooling fans, or aquarium systems.

## Description

Specifications: Model: W1209 With Case Dimensions: 48.5 * 40mm Temperature Control mode: ON / OFF Temperature Range :-50 - 110 degree centigrade Resolution: When temperature is 0.1 degree, the resolution is -9.9~99.9, other temperature segment is 1 degree. Control Accuracy: 0.1 degree Hysteresis Accuracy: 0.1 degree Refresh Rate: 0.5s High Temperature Protection 0 - 110 degree centigrade Supply Voltage: DC 12V Static Current: Less than 35MA, attract current less than 65MA Output Voltage: DC 12V Output Power: 20A relay Measurement Input: NTC (10K 0.5%) Waterproof Sensor Environmental Requirements: -10 - 60 degree centigrade; Humidity 20% - 85% Instructions for use: Connect the power supply and equipment, the measuring temperature is displayed, press the "SET" button, press " + or - " to set the desired temperature (long press " + or - " to quickly increase or decrease), press "SET" to confirm the setting and return, controller automatically performs the relay ON/OFF. the thermostat output is 10A relay, meet a variety of high-power loads. LED Indicator: LED off indicates the relay off; Lighting, indicates the relay is closed. Digital LED Tubes: "LL" indicates sensor open, "HH" indicates overrange, the relay will be forcibly disconnected; "---" indicates high temperature alarm Long press the "SET" button to enter the main menu settings, press " + or - " to switching between P0-P6, then long press "SET" or 10 seconds without keystrokes to confirm the setting and return. Package Included: 2 * W1209 12V DC Digital Temperature Controller Board With Case

Review: Air Conditioning Freezing Fixed! - While there are plenty of professional fixes for central AC that freezes up, sometimes it's just a combination bad duct airflow, low outside temp, and/or too low thermostat set. Obviously you should make sure you aren't low on refrigerant or the air filter is dirty, but if you have old ducting or a miss-sized unit, it just happens sometimes (especially fall and spring). If your wallet doesn't mind the thousands of dollars to get a new AC installed or otherwise remedied, skip this. For the rest of us, this little gem you just provide it 12V (find an old wall wart, or buy one for a few bucks), cut one of the signal wires from the furnace to the AC (usually 2 of them, carrying low voltage AC, doesn't matter which one you cut), strip the ends on both sides of the cut and put them into the two relay legs (K0 K1), and then tape the temp probe to the copper coolant-in line. Set the setpoint to somewhere a little above freezing (5C or so), set P0 to "C" for cooling, and then set P5 (restart time) to 5 minutes. Now, if the line approaches freezing, it will cut out the AC unit outside while the furnace/air-handler fan still blows air over the too-cold coils warming them up. The restart delay prevents short-cycling the AC. Cheap, easy, works. Will mask a dirty air filter, but you're changing that on a regular schedule, right?
Review: Worked great for fan control - I have a home made cabinet for my CNC router. There is a compartment for the computer, but it doesn't have much air circulation. The other day I noticed the temperature was quite high in the cabinet and possibly a contributing factor for a recent hard drive failure. I wanted to add a fan to circulate air, but since the computer goes in to sleep mode and doesn't generate much heat when it's not being used, I didn't want something that ran all the time. With this gizmo and a 12V fan, I was able to set it up so the fan only runs when the temperature in the cabinet exceeds a certain amount. So far it seems to be working great. I have it set to come on at 32C and go off at 30C, and it's been been right in that range each time I've noticed the fan running. Set up was easy. I already had a 12V supply available in the cabinet, so all I had to do was hook up the power, insert the K0 and K1 ports inline with the positive lead of the 12V going to the fan, and drop the sensor in the cabinet. As I recall the default settings were what I needed, except maybe changing the temperature range. I opted for the case and that was worth the extra 60 cents. I could have laser cut my own, but it probably would have cost me 60 cents worth of material and certainly more than that in time. The only complaint about the case is that is doesn't provide any holes to mount it to anything unless you want to use the same holes used to hold the case together. No big deal - some double sided foam tape got the job done. Definitely worth it for less than $5 each.

## Features

- 100% complete machine patch, wave soldering, stable performance, good consistency.
- Embedded CPU chip (MCU), more intelligent, lower power consumption.
- Automatic power set memory (MCU built-in EEPROM memory unit).
- Control accuracy of 0.1 degrees Celsius. Have been tested for stability, consistency and reliability.
- Tips: - long press set to get menu, starts at P0 - press +/- to get next P-parameter - press set to choose that parameter - press +/- to select the value you want for that parameter - press set to accept it - long press +/- = reset to default - power-out does reset to default - default temp set is 34.5C

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07VDRGK9F |
| Best Sellers Rank | #29,779 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #29 in Temperature Controllers |
| Brand | HiLetgo |
| Brand Name | HiLetgo |
| Color | With Case |
| Customer Reviews | 4.2 out of 5 stars 982 Reviews |
| Display Type | LED |
| Item Weight | 0.09 Kilograms |
| Manufacturer | HiLetgo |
| Material | Plastic |
| Material Type | Plastic |
| Model | 3-01-1310 |
| Part Number | 3-01-1310 |
| Smart Home Compatibility | Not Smart Home Compatible |
| Voltage | 12 Volts |

## Product Details

- **Brand:** HiLetgo
- **Color:** With Case
- **Display Type:** LED
- **Item Weight:** 0.09 Kilograms
- **Voltage:** 12 Volts

## Images

![HiLetgo 2pcs W1209 with Case 12V DC Digital Temperature Controller Board Micro Digital Thermostat -50-110°C Electronic Temperature Temp Control Module Switch with 10A One-Channel Relay and Waterproof - Image 1](https://m.media-amazon.com/images/I/61zhEBHUK+L.jpg)

## Available Options

This product comes in different **Color** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Air Conditioning Freezing Fixed!
*by J***S on October 3, 2025*

While there are plenty of professional fixes for central AC that freezes up, sometimes it's just a combination bad duct airflow, low outside temp, and/or too low thermostat set. Obviously you should make sure you aren't low on refrigerant or the air filter is dirty, but if you have old ducting or a miss-sized unit, it just happens sometimes (especially fall and spring). If your wallet doesn't mind the thousands of dollars to get a new AC installed or otherwise remedied, skip this. For the rest of us, this little gem you just provide it 12V (find an old wall wart, or buy one for a few bucks), cut one of the signal wires from the furnace to the AC (usually 2 of them, carrying low voltage AC, doesn't matter which one you cut), strip the ends on both sides of the cut and put them into the two relay legs (K0 K1), and then tape the temp probe to the copper coolant-in line. Set the setpoint to somewhere a little above freezing (5C or so), set P0 to "C" for cooling, and then set P5 (restart time) to 5 minutes. Now, if the line approaches freezing, it will cut out the AC unit outside while the furnace/air-handler fan still blows air over the too-cold coils warming them up. The restart delay prevents short-cycling the AC. Cheap, easy, works. Will mask a dirty air filter, but you're changing that on a regular schedule, right?

### ⭐⭐⭐⭐⭐ Worked great for fan control
*by S***E on November 16, 2021*

I have a home made cabinet for my CNC router. There is a compartment for the computer, but it doesn't have much air circulation. The other day I noticed the temperature was quite high in the cabinet and possibly a contributing factor for a recent hard drive failure. I wanted to add a fan to circulate air, but since the computer goes in to sleep mode and doesn't generate much heat when it's not being used, I didn't want something that ran all the time. With this gizmo and a 12V fan, I was able to set it up so the fan only runs when the temperature in the cabinet exceeds a certain amount. So far it seems to be working great. I have it set to come on at 32C and go off at 30C, and it's been been right in that range each time I've noticed the fan running. Set up was easy. I already had a 12V supply available in the cabinet, so all I had to do was hook up the power, insert the K0 and K1 ports inline with the positive lead of the 12V going to the fan, and drop the sensor in the cabinet. As I recall the default settings were what I needed, except maybe changing the temperature range. I opted for the case and that was worth the extra 60 cents. I could have laser cut my own, but it probably would have cost me 60 cents worth of material and certainly more than that in time. The only complaint about the case is that is doesn't provide any holes to mount it to anything unless you want to use the same holes used to hold the case together. No big deal - some double sided foam tape got the job done. Definitely worth it for less than $5 each.

### ⭐⭐⭐⭐ Cheap, effective, no instructions
*by Z***X on March 6, 2019*

I purchased this product for a little side project. I wanted to add a 12v fan to cool the charging transformer in a battery backup when it is charging on commercial power, but didn't want the fan to run 24x7. The UPS is no longer charging the small 7AH 12V batteries, but rather two 90AH 12V batteries. Installation of the device in the UPS case was pretty simple, but wiring and configuration was a different challenge since this product comes with absolutely no documentation. Keep in mind that this unit only deals with Celsius. If you want to know Fahrenheit, you'll need to convert it. Fortunately, some other reviews here have links to instructions and wiring diagrams. To wire it for 12V power to the controller board **AND** to the load device (fan in my case), do the following: 1. Connect the 12V power source to the +12V terminal 2. Run a short jumper wire from the +12V terminal to the K1 terminal, tighten down both +12V and K1 terminals. 3. On the 12V device, (fan in my case), connect the positive power wire to the K0 terminal and tighten the terminal 4. On the 12V device, (fan in my case), connect the negative return wire to the GND terminal. Also connect the negative return wire from the main power source to the GND terminal. Tighten down the terminal. To program the device for running a **cooling** fan like I did, do the following: 1. Short press "SET" button one quick time and set the desired "turn off" temperature with the "+ or -" buttons. This is the temperature that your fan will turn off once reached. Once you have your "off" temperature selected, press the "SET" button again. This should get you going. If you set the temperature to 30C, the default swing temperature is 2C. This means that the temperature probe must get to 32C before the fan will turn on. The fan will run until the thermal probe drops back to 30C, then shut off. If you want to change the default swing temperature from 2C, do the following: 1. Long press "SET" button until P0 shows on the screen. Press the + button until P1 is displayed. Short press "SET" button to modify that value. You should see "2" which is the current default setting. Press "+ or -" until the desired temperature is reached, then short press "SET" button again to set the new value. If the main "off" temperature is set to 30C like the above example, and you set P1 to 10, then the thermal probe would have to get to 40C before the fan kicks on. The fan would then run until the thermal probe reaches 30C before shutting off.

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*Product available on Desertcart Belgium*
*Store origin: BE*
*Last updated: 2026-07-03*