UCTRONICS 0-167°F Fahrenheit Digital Temperature Meter Blue LED Display MF55 Type NTC Thermistor Temp Sensor 2-Wires Reverse Polarity Protection with Black Case

4.5 stars. The one I received can not be calibrated. It's a single pcb directly soldered to the led display with no pot. I tested and accuracy was within one degree from other instrumentation. It is super bright, and for my use I added an amber film to dampen the brightness. Wires can be extended as needed.

Had some issues with my 12 yr old (!) Solar water heater, needed to replace sensor and circulator pump. Was not sure of the controller, and since the tank and roof sensors were 10k NTC, I bought this meter to troubleshoot. Could have built it into a small case with switches, etc., but instead simply attached a 9v battery with some "sticky tape" (used for weather-sealing outdoor coax) to the bottom, bought some wire leads with connectors ( https://www.amazon.com/gp/product/B076JFFDWN ) and wired them into my sensor leads. Very quick and dirty works perfectly to get temp readings from the tank, roof, and water faucet by simply attaching the relevant lead to the back of the display module. Allows easy adjustment of hot water temperature, will buy another on shortly. Calibrated nicely at 32 degrees in an ice bath, did not check high end. Note reading will only up to 167 degrees F, above that flashes "HHH". Similarly low end flashes "LLL" when sensed temperature is too low.

Works as designed

Added This to my Jeep for outside temp reading. Bright display. Accurate. Looks nice. I ordered a second one.

I purchased two of these. Neither one worked correctly. The leads for power and the thermal lead are extremely short and would not work for the application I purchased them for.

It's accurate at about 1F.I tried with 10ft of very thin wire and it did not affect the value, so don't worry about adding wire length.Dimensions of the opening if you want to do some 3D printing should be 45.4x27.5mm and the thickness of your panel should be about 1.5mm ideally in order to fit well with the little things that hold it in place. Count about 31mm deep for everything to fit with the wire sockets.Now if you also want the border to insert in your panel so everything is leveled, that part is 47.85x29mm and is 2.7mm thick.

Ordered two after receiving them one numerals would not light completely. Item was replaced quickly and without any hassle. Good quality for the price and service.

good value and supportan inaccurate value may be caused by vibration or dampness. Could you please wash the circuit board of the thermometer with anhydrous alcohol, dry it and recalibrate it.The calibration method is the following:Step1: Find a standard thermometer and wrap the sensor of the standard thermometer with the sensor of the inaccurate thermometer for five minutes.Step 2: Adjust the micro-adjustable resistor on the circuit board of thermometer by a small cross screw, make sure that the display value is consistent with the standard thermometer.Step 3: Keep the two wrapped temperature sensors suspended and do not touch the human body or other objects during the calibration.