




Price: $5.99
(as of Dec 01, 2025 11:22:15 UTC – Details)
4pcs temperature controller module with case W1209 12v dc digital temperature controller board micro digital thermostat -50-110°C electronic temperature temp control module switch with waterproof NTC probe
Using Method:
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
Specifications:
Model: W1209 with case
Dimensions: 48.5 x 40 mm
Temperature control mode: ON or OFF
Temperature range: -50-110°C 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: 0.5 s
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 percent waterproof sensor
Requirements: -10 – 60 degree centigrade, humidity: 20 – 85 percent
Package includes:
4 *W1209 12V DC digital temperature controller board with case.
【W1209 Features】The W1209 thermostat module controller has a sensor input, keys, LED display, and a relay.Absolutely complete machine patch, stable performance, good consistency.
【Embedded CPU Chip】The XH-W1209 led display digital thermostat module embedded CPU chip (MCU), is more intelligent, lower power consumption; Automatic power set memory, MCU built-in EEPROM memory unit.
【Temperature Controller Parameter】Temperature range: -50-110°C; Control precision: 0.1 celsius.Input power (DC): 12V; Measuring inputs: NTC (10K 0.5%) ; Waterproof sensor: 0.5M; Output: 1 channel relay output, capacity: 10A; Power consumption: Static current: 35mA; Current: 65mA.
【Waterproof NTC Probe】The NTC probe is waterproof and can control the temperature, allowing to control heating or cooling.(The wood laminate case is the clear plastic case. You need to tear the wood outside layer off carefully, the outside layer is very thin, which can protect the inside to prevent scratches; And you need to assemble and install the case by yourself, it comes disassembled with tiny bolts and nuts.)
【Package Includes】4pcs W1209 12V DC digital temperature controller board with case.(Ps: The product is not assembled, if you need assembly instructions or if you encounter any problems during use, you can contact us at any time. Thank you for your support.)
8 reviews for 4pcs Temperature Controller Module with Case W1209 12V DC Micro Digital Thermostat -50-110°C Electronic Temperature Temp Control Module Switch with Waterproof NTC Probe
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$5.99

Erik Kubec –
Great value, even has non-volatile memory!
Crazy value. Even has non-volatile memory: it retains settings when powered off and on. Either heating or cooling. It takes a bit of patience to assemble, but no you don’t need to be an electrical engineer lol.
Amazon Customer Warren –
Temperature Sensor for alarm systems
Bought this as a replacement of the Honeywell TS300, which is a 4 wire, 12 volt dc programable temperature sensor. I have been using the TS300 for years and years as a low temperature sensor on my Alarm jobs in clients’ homes to detect a drop in temperature Before the house freezes and pipes break!Yes, this product is supplied in pieces, not assembled, and Celsius only. But I could not find anything else on the market!I put it together, looked up how to program it, tested it – it worked perfectly!It was simply to assemble and program!I have installed in in two clients to date, and I am very happy with it!!I put it in the boiler room and set it for 10 degrees Celsius, no boiler room should ever get lower than that! and if it does, the alarm system notifies me that it is, so action can be taken!I will be using this product from now on, on all my installs!!And the price is crazy Low! It is worth 10 times this price!!If it was in Fahrenheit, I would have given it 5 stars!
user56 –
I can’t make it turn the heater on.
It measures temperature, but does not seem to actually drive the heater connected to it, which makes it worthless.There is nothing useful in the info provided to make it work.
SSMinnow –
They work period.
They do exactly what they are design to do. The others who complain about them do not understand electronics. As for assembling the case. very easy. again people who complain don’t know what they are doing…
E. Mata –
Cheap but no instructions
Had to look how to run my wires. Just wanted a cheap way of monitoring temp on my electric icebox and have it shut off when temp got too low. There is videos out that explain how to use this. Look up W1209 12V -50° to 110°C Digital Thermostat and that should bring up lots of resources. I’ve included some pictures I found in my review and hope they are useful.
rafael brens –
Why is this ?
Well I don’t understand when I built the circuit the front face cover is completely close to see the number why?? They show the product with clear face plastic cover
Sarah Smith –
DO NOT BUY this unless you are electronic engineer.
This product is completely unassembled. This does not have a case.. Its just bags of parts that you are supposed to put together WITHOUT INSTRUCTIONS! Don’t waste your money.
luis a reyes –
Precision
NO tiene manera de ajustar la precision, si la tuviuera tendria 5