Fridge Freezer Thermometer Max/Min Memory GXSTWU High & Low Temperature Alarms Settings with LED Indicator Digital Refrigerator Thermometer with Magnetic,Stander Blue 2pack

Good

I got these as secondary temperature monitors to monitor two tortoises during hibernation, having tested them in some ice water these read about +1 degree higher than what they should do but they will do as a backup alarm system for my tortoise hibernation

The instructions for this product are difficult to read never mind understanding. I bought two there’s one in the freezer the other in the fridge I don’t know if they’re working I don’t look at them

I fitted these thermometers to our fridge freezer using the probes inside the fridge and the freezer. They appear to be very accurate and are quick to respond to temperature fluctuations, and that's the point to note. The alarm went off just after we went to bed which was annoying and after checking for half an hour, I concluded the auto defrost was in action, and the temperature soon returned to normal. Further research on the internet explained that the air temperature inside the fridge or freezer increases quite quickly if a) you open the door and b) when it auto defrosts. So the solution recommended by a fridge manufacturer is to put the probe in the fridge into water and the probe in the freezer into cooking oil, which 'damps' the temperature fluctuation. So, I used two plastic cola bottles, drilled a hole in the lid for the probe filled one with water and the other with cooking oil. This now effectively monitors the temperature of stuff in the fridge rather than responding too quickly to air temperature changes. By the way, it is fiddly to set the min & max temp. alarm but follow the instructions carefully and/or watch the video and it is straightforward.

Tested this product against a fridge with a digital temp display set at 3 deg C and another thermometer. This product measured between 7 and 8 deg C. I expect some variation, but to say my fridge is effectively broken is ridiculous. Disappointed because I like the large display and the features (which I why I bought it). But it isn't accurate enough for my (or probably anybody else's) needs. Might be a faulty unit of course, but both units returned and I'll look elsewhere.

Seems ok for the money, not quite sure about accuracy.

The in/out function using the wire sensor is brilliant. It allows you to see at a glance what is happening inside your fridge without opening the door. The quality seems pretty good and the magnet hasn't slipped in months of use despite not feeling that it would. Overall very happy.

I didn’t realise when I bought these that the alarm function only works for the temperature outside the freezer/fridge. But it was a check on the contents I needed, not the room the freezer stands in. Returned easily for a refund, but no use to me. Worth checking if this us what you want it for.