--- product_id: 260733277 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: "R689" currency: ZAR in_stock: true reviews_count: 5 category: "Hi Letgo" url: https://www.desertcart.co.za/products/260733277-hiletgo-2pcs-w1209-with-case-12v-dc-digital-temperature-controller store_origin: ZA region: South Africa --- # Waterproof sensor Low power <35mA standby ±0.1°C precision 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:** R689 **Availability:** ✅ In Stock ## Summary > 🌟 Master your environment with precision — because your gear deserves smart control! ## 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?** R689 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/products/260733277-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 - • **Smart Embedded MCU:** Intelligent CPU chip with EEPROM memory ensures stable, energy-efficient operation and automatic power recovery. - • **Robust 10A Relay Output:** Supports high-power devices seamlessly, perfect for demanding HVAC or custom cooling setups. - • **Versatile & Durable Design:** Compact waterproof sensor and rugged casing built to thrive in diverse environments from aquariums to motorcycles. - • **Pinpoint Temperature Control:** Achieve ultra-precise climate management with 0.1°C accuracy for flawless system performance. - • **User-Friendly Digital Interface:** Quickly set and monitor temperatures via intuitive LED display and simple button controls—no tech degree needed. ## Overview The HiLetgo W1209 Digital Temperature Controller is a compact, energy-efficient thermostat module featuring a high-precision 0.1°C control range from -50 to 110°C. Equipped with an embedded MCU chip and a 10A relay, it delivers reliable ON/OFF temperature regulation for various applications including HVAC, aquariums, and automotive cooling. Its waterproof sensor and user-friendly LED interface make it a versatile, durable solution for professionals seeking smart, stable temperature management. ## 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: 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: I used this as a fan controller for my motorcycle. I put the sensor into the radiator fins and dialed in the temperature I wanted to see on the temp gauge. The fan comes on and goes off precisely and crisply compared to the thermo switch that was impossible to find for an older bike. It now starts the fan smartly as opposed to groaning to life with the thermo switch. Just connect the device (+) source power to the running light circuit which comes on when the engine is running. For the fan, provide frame ground, and positive from battery, then through 10A fuse, then through switched relay onboard the device to the fan positive. The programming is simple if you google the device specs on YouTube. ## 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 d for stability, consistency and reliability. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07VDRGK9F | | Batteries required | No | | Best Sellers Rank | #70,792 in Computers ( See Top 100 in Computers ) #1,053 in Single-Board Computers | | Customer Reviews | 4.1 4.1 out of 5 stars (416) | | Date First Available | 30 July 2019 | | Display type | LED | | Item model number | 3-01-1310 | | Item weight | 0.09 Kilograms | | Manufacturer | HiLetgo | | Product Dimensions | 4.85 x 4 x 4.85 cm; 91 g | ## Product Details - **Brand:** HiLetgo - **Colour:** With Case - **Material:** Plastic - **Product dimensions:** 49L x 40W x 49H millimeters - **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 ### ⭐⭐⭐⭐⭐ Review *by J***S on 3 October 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? ### ⭐⭐⭐⭐⭐ Review *by E***M on 27 June 2023* I used this as a fan controller for my motorcycle. I put the sensor into the radiator fins and dialed in the temperature I wanted to see on the temp gauge. The fan comes on and goes off precisely and crisply compared to the thermo switch that was impossible to find for an older bike. It now starts the fan smartly as opposed to groaning to life with the thermo switch. Just connect the device (+) source power to the running light circuit which comes on when the engine is running. For the fan, provide frame ground, and positive from battery, then through 10A fuse, then through switched relay onboard the device to the fan positive. The programming is simple if you google the device specs on YouTube. ### ⭐⭐⭐⭐⭐ Review *by C***K on 19 December 2025* These controllers work well and you can't beat the price. I'm using one to control a 20W silicone heater for an enclosed butter warmer. I keep the house cool in winter, and I got tired of mangling my toast when trying to spread cold butter. These don't have a parameter to switch from Centigrade to Fahrenheit display units like others do, but no big deal. ## Frequently Bought Together - 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 - KEYFANCLUB 2-Pack 120mm Fan DC 12V Computer Fan 120mm x120mm x 25mm 2-Pin High Performance Cooling Fan - KEYFANCLUB 2-Pack 80mm x 25mm DC 12 Volt Fans 2-Pin Brushless Replacement Cooling Fan --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.co.za/products/260733277-hiletgo-2pcs-w1209-with-case-12v-dc-digital-temperature-controller](https://www.desertcart.co.za/products/260733277-hiletgo-2pcs-w1209-with-case-12v-dc-digital-temperature-controller) --- *Product available on Desertcart South Africa* *Store origin: ZA* *Last updated: 2026-05-13*