KT3100BL

I use this unit to "convert" a vintage (1970's) chest freezer into a refrigerator. The temperature range settings are very easy to adjust, and the included booklet has good instructions to do such. I appreciate that this unit displays the current temperature of the unit (via a temperature probe), as well as the current settings for max/minimum temperature ranges. I have been using this for several months and it hasn't skipped a beat. I have auxiliary analog thermometers in the actual fridge itself, and they indicate the same temperature as the digital readout on the unit itself. It is very user-friendly to set up and adjust. I am quite happy with this thermostat and would likely purchase another one if needed in the future.

I use this with a space heater to control the temperature of my bedroom. I like that the thermometer is attached via a long wire, so I can move the thermometer a distance away from the heater, so it better represents the average temperature of the room. To help buffer the thermometer from brief changes in temperature (e.g. AC kicks on, hot or cold breeze), I wrapped it with a paper towel and tape. Setup was easy and I haven't experienced any glitches. The only thing I can complain about is the blue indicator light that turns on when the temperature is within the operating range. It's very bright. To address this, I put some tape over it, no big deal.

Seems to be an industrially oriented device, but I bought it to control a space heater in a garage where I had pipes I did not want to freeze. Seems to work fine. You can set F or C degrees, then when the heater is turned on, and when it turns off so the temperature never gets to freezing or too high. (You need a spread between the two of those temperatures for the obvious reasons. What's nice is the thermistor is off the base, so you can place it away from the heater which might otherwise interfere with the function if too close. Other features that might be fun to play with are countdown, countup, and intermittent timing circuits for other potential applications, but I am happy with the one function I will use it for. Of note, there are devices where the thermistor and controls are wireless and away from the base. I use one in my bedroom. Both devices though should save a lot of heating costs in areas that my HVAC system does not address well, and I can set the whole HVAC system to a lower temperature in the winter while protecting areas where I want to be sure pipes freeze or where I want a little extra, but not too much, warmth.

Buying appliances in the middle of a supply chain crisis is no fun. When I purchased an extra refrigerator a year ago, I was lucky to find one at all. Unfortunately, I didn't get one that was "garage" certified, which meant I lost a bunch of perishables when my garage got too cold (the ambient thermostat will turn off the fridge when it gets too cold). The solution was the combination of a Diophros 1500W Space Heater, and a KETOTEK Digital Thermostat Outlet Plug. I'm only using the temperature control mode of the KETOTEK, but it's working great. I'm turning on my "dumb" space heater at 10C, and it shuts off at 12C. That's enough to keep the ambient thermostat on my fridge happy, and I won't have to waste a ton of energy on the heater when it's warm enough without it on. The thermocouple seems accurate, and it's great that you can locate it away from the outlet. I don't love that the design of the unit blocks other outlets on my power strip (it blocks 4 of them, due to the specific nature of my power strip). I also don't like that the blue LED is so bright, as it makes the LCD hard to read without direct lighting. Those are minor quibbles, though, as the KETOTEK is an inexpensive and reliable method for keeping my fridge working when the garage is cold - without wasting energy when it's warm enough for the fridge to operate normally. Recommended

Saw them on a technology connections video and knew I needed them. I’d been looking for a good controller for my space heater and these work fantastically. I’ve even got one out in the well house that’s been going strong all winter.

Bought this to regulate the temperature of a towel warmer i made. It has been great. Easy to use, with a very long temperature probe wire. It is accurate in the high low temp setting and easy to change when necessary. Nice thing about the probe is it measure air temp, without having to actually attach to anything, (metal to metal).

I've took to keeping a space heater in my room lately. The furnace never comes on when it is cold in this room, and when it does, it stays on so very long after it gets uncomfortably hot. So I closed that vent and got a space heater. Problem is. When the "heat" kicks off. The "fan" keeps going. That sucks in two ways. First it way to noisy. Then, the cold air from the fan hurts my head. BUT. turn the thermostat on my heater all the way hot. And use this little gem as the thermostat. And when it turns "off". No more fan. And this is accurate to a tenth of a degree fahrenheit. AND the temperature sensor (thermocouple), is no longer in the heater. Or even the plug. It is on the end of a 3 meter wire. Put that sensor up on the wall and enjoy a "true" 70.4 degrees fahrenheit. You get to set your "turn on" and your "turn off" temperature. So, in my scenario. Kick on at 70.2 and off at 70.4. That is a pretty tight tolerance, yes. And when the snow blows. That heater is on and off, every couple minutes. And when your thermocouple is accurate to a tenth of a degree. A person can do that. This is a must have for my situation. It will also go down. If you put the thermocouple in a refrigerator the the electronics are not functional. Maybe you are going to use it in the garage. It will go into "cooling" mode. If the "start temperature" is higher than the "stop temperature". That setting is automatic. Easy peasy. But as for settings. FIRST THINGS FIRST. You need to pick your measurement scale (fahrenheit or Celsius). You gotta long press "something". The "set" button?? maybe, i don't remember??

I got this product the other day and read the instructions and started playing with it. The instructions appear to be good but what you don't know is that they leave out a critical detail that you need, which precludes the use of the 4 timing functions. I was -> <- THIS close to returning it. That's why I gave this 3 stars. I went to lots of trouble to figure out how to use this device, to the extent of reading a bunch of reviews on Amazon and Ali Express and experimenting a good bit. And, I'll tell you exactly how it works. The product has a temperature control mode which can do heating or cooling. The instructions say up to 15 A resistive (like a heating element or lamp) and only 2 A inductive (anything with a motor like a refrigerator, freezer, air conditioner, or fan). 2 A inductive (in the USA) is only 240 W. This is NOT enough power to run a window air conditioner. It is enough to run a small refrigerator, freezer, or a pretty good fan. The unit appears to remember settings over a short term power failure. I have not tested it for long term power failures. If the device isn't behaving like you think it should, press the lower dark spot between the buttons which is a reset button. Here are my descriptions of what the buttons do: MODE - short press - Switch modes if there's not timing cycle engaged. If you are programming some digits, MODE ends the programming, or you can wait for a timeout. MODE - long press - This is what the manual doesn't tell you. This will engage or disengage a timing cycle after you've set the digits. SET - short press - Engage setting mode (settable digits flash). Switch digits to set. SET - long press - If in temperature control mode, change from Fahrenheit to Celsius and back. Here's how to use each mode. Use MODE to get into each mode if there's not a timing cycle engaged. If a timing cycle is engaged, you must disengage it to change modes. Do not initially plug in your heater or cooler or fan or turn it on. The outlet may go ON as soon as you enter temperature control mode. A blue LED above the reset button lights up when the outlet is ON. Temperature Control Mode - active if you see 3 temperatures in either degrees F or degrees C and a heating or cooling icon. If the start temperature is lower than the stop temperature, you are in heating mode. The heating icon will show up. In heating mode, the outlet may go ON immediately if the measured temperature is below the stop temperature. The measured temperature does not have to be between the start temperature and the stop temperature for the outlet to go ON. If the start temperature is higher than the stop temperature, you are in cooling mode. The cooling icon will show up. In cooling mode, the outlet may go ON immediately if the measured temperature is above the stop temperature. The measured temperature does not have to be between the start temperature and the stop temperature for the outlet to go ON. To set the unit press MODE until the three temperature readings appear. Press and hold SET if necessary to change from Fahrenheit to Celsius and back. If I say press something, that means press and release. Press SET. Some digits should start blinking. Press, or press and hold UP or DOWN to set the digits. Press SET to go to the next set of digits. Set them the same way. Press the MODE button to end setting or wait for a timeout. Place the temperature sensor where it can measure the temperature of the space or object or liquid you're interested in. I DON'T know if the sensor is waterproof. To set heating mode, set the start temperature below the stop temperature. The outlet may immediately go ON if heating is required. Plug in and turn on your heater. If the heater has its own thermostat, set it to maximum temperature or continuous ON. To set cooling mode, set the start temperature above the stop temperature. The outlet may immediately go ON if cooling is required. Plug in and turn on your cooler or fan. If the cooler or fan has its own thermostat, set it to minimum temperature or continuous ON. The unit either runs in heating or cooling mode. It does not switch modes automatically. The unit should maintain the desired temperature range by cycling the heater, cooler, or fan on and off. If you want to force the outlet to go off manually, you can enter a timing mode without engaging it. The unit has 4 timing modes. Press MODE to get into each mode if there's not a timing cycle engaged. If a timing cycle is engaged, you must disengage it to change modes. The timing modes do not do time of day or day of week. They are only time intervals. F01 Cycling Timer is the first timing mode. The unit turns the outlet on for the time specified in ON and off for the time specified in OFF then repeats. Press SET. Some digits should start blinking. Press, or press and hold UP or DOWN to set the digits. Press SET to go to the next set of digits. Set them the same way. Press the mode button to end setting or wait for a timeout. Set the ON time and OFF time as desired. Then, which the manual leaves out, you must engage the mode. Press and hold MODE to engage the timer. The outlet should turn ON and the ON timer should start counting down 1 minute at a time. Note that the ON and OFF timers do not show the set point while running. They show the current countdown. When the ON time reaches zero, the outlet should turn off and the OFF timer should start counting down. When the OFF timer reaches zero, the cycle should repeat. If you wish to disengage timer mode, press and hold MODE. You will then be able to switch to other modes again. I have not tested the remaining modes, but here's what the manual says they do (paraphrased): F02 Count Down ON - output turns ON after the countdown ends. F03 Count Down OFF - output turns ON UNTIL the countdown ends. F04 CD ON CD OFF - output turns ON after the ON countdown ends, then the output turns OFF after the OFF countdown ends. Hopefully, this will help you use the device to the fullest. If you have read this review, and now you know how to use the device, I do recommend the device itself. It seems to work well. I have only tested it briefly, and have not done long term testing. Ron

I like that it seems accurate, it's easy to adjust, but I didn't see a manual with it and I don't understand quite yet how the other modes work, but very ideal if I can program a cooling setpoint and heating setpoint! I have this connected to 120v fans mounted on my register upstairs. Upstairs used to be 5-6°C warmer then the main floor, now this helps me keep it within 2°C

I bought it and it worked okay but I need model with powered up cord.