QS-TMC-02 Digital Temperature Controller Thermostat | 90V-250V AC Wide Voltage | Automatic Temperature Switch for Incubator, Aquarium, Greenhouse, Fridge & Heater Control

Nice thermostat, works well and very accurate, high cut and low cut works well, highly recommended

Plus: 1. Product is very Good & Robust. Used it for a DIY Room Heater Temperature Control. 2. Temperature Indicator update rate is sufficiently fast. Temperature Readout is accurate. 3. Unit is surprisingly small for its functionality Minus: 1. Setup Manual provided has a lot of Typos, was completely useless. Found complete information here: https://images-na.ssl-images-amazon.com/images/I/71VSFdFfszL.pdf 2. Buttons for controlling Temperature Setpoint is small. Need to keep S Button pressed for setting desired value.

Temperature control is awesome, works best in terms with other fake products with the name of stc 1000. The accuracy of product is upto 0.01 degree correct. Accuracy is very important for these types of products because I'm using it for egg incubator, precision is compulsory for them. This product is genuinely works great. Main point is that price is way better than other brands which costs upto double the price of this product. The cheap price makes this thing is affordable to all the customers who can't buy those expensive products but they got high class accuracy, temperature control like those expensive controllers. Next review will provide after using it for atleast one month. I will provide genuine review after using it for some time. By the way nice packaging and delievery provided by seller and Amazon. Thanks

Bad product not working after 1 month

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Nobody explained it but this digital thermostat is a dual nature temperature controller. It has got 2 separate circuits for controlling both heater AND a cooler at the same time. If you only wish to control 1 device at a time (only heater or cooler) then you can buy the cheaper ones also. I didn't know this difference and bought this device thinking that it has better quality or durability. Suppose you set it to maintain 25 degree celsius with a variation of 1 degree. So when temperature drops below 24 (25-1) then heater circuit gets triggered, then it doesn't allow heating or cooling until the temperature is maintained in +/-1 degree range of 25 i.e. between 24 and 26. Now if the heating turned out too strong and quick and the temperature goes above 26, then the cooling circuit is triggered to cool down and bring the temperature within the acceptable range i.e. 24 to 26 degree, and cooling circuit will close when temperature comes down to 26. The same cycle goes on repeatedly to maintain your desired temperature range. I was bewildered as to how to operate it, the instruction manual was useless, so figured it out myself: Operating instructions: Press On/off switch (top left one) for 3 seconds to turn it on or off. Now it will show the current temperature detected by the sensor. Hold "S" button (bottom left one) for 3-4 seconds until you see "F1" on the screen. F1 is the temperature value which you want to maintain. To change this value, press both S and UP buttons together to raise it, or S+Down buttons to reduce it. Suppose you set it at 25 as per above example. Press UP button (top right one) and you will see F2. This is the temperature variation you want to allow. It can go from 0.3 degree to 10 degree celsius. Same method to change it, press S+UP or S+DOWN buttons together to change. For example you set it at 1.0 degree. F3 and F4 are for calibrating the temperature, not required normally. I am using it for a room OFR oil filled heater. I am not using the heater at its full 2400 watts, I am only using the heater at a 1600 watts power setting, I have used heavy 1.5 sq mm wires for this digital thermostat and with this setting, there's no issue of heating or melting. NOTE: You can use any cheap copper wire to increase the length of the thermostat sensor, I have increased it by 12 feet. Even if you add 50 feet of wire, it won't change the thermostat sensor reading. This is a THERMISTOR type of sensor which changes resistance based on temperature. And 50 or even 80 feet of copper wires doesn't cause more than 0.5 ohms of resistance, which will be equal to 0.001 degree celsius change in temperature reading. NOTE 2: Even though the thermostat detects 26 degree celsius, it doesn't feel the same. For example, during peak summer, we keep the AC at 20 degree celsius, whereas we keep it at 25 during mild summer. Even though the room temperature is pretty much the same during both these settings. Similarly, during winter, I found that I had to change the F1 temperature to 28 degrees for harsh winter nights and at 24 for mild winter nights. If I kept it at 25 during harsh winters, by the time the room temp drops to 25 and below, we start feeling uncomfortably cold.

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Despite several Emails, whatsapp messages, no respone. Temperature controllers are faulty, readings continuously fluctuate. Don't buy.