Review on 🌡️ GuDoQi Aquarium Thermometers: 4 Pack of Digital Water Thermometers with Suction Cup for Fish Tank, Aquarium, and Marine Reptile Habitat Temperature Monitoring by Karina Rodriguez

To be honest when I look at a product like this that retails for $3 ($4/$12) I admire it. I mean, the damn thing works pretty much as advertised. I bet none of us can send a letter to China for less than $5, but someone out there can do it and mail it to the US for a retail price of $3. How do you do that? And yet we complain about something like they just bought a Ferrari instead of a cheap three-dollar thermometer. Perspective people! However, the complaints I've read about the °C/°F switch are valid. It's terrible. You can tell it's not a real switch. It's just a piece of plastic with some metal on the bottom sliding over a circuit board with very poor contact. The temperature display jumps back and forth between the two readings, apparently preferring the °C setting. You can tap the thermometer lightly and the reading will jump between F and C. This is bad. Then all thermometers arrive fully charged. The batteries have been there since the thermometers arrived from China. How much will this reduce the overall battery life? I don't know but it seems wasteful for the customer. To be fair, I'd bet if they shipped it with the battery removed a large percentage of buyers wouldn't figure out how to install a single LR44 battery. There are still people in this world who don't know how to sharpen a pencil. The last complaint is the size of the display. Its height is only about 1/4 inch. I wasn't sure I would like these thermometers because I needed a metal probe which I thought would respond faster than the probe on this one which appears to be immersed in a layer of plastic. Then I ordered another set of thermometers with this sensor: www.amazon.com/gp/product/B086CBMXMJ They have a larger display and solve the problem of converting two temperatures by simply not offering a choice: it always shows °F an problem solved ! If you prefer °C there is probably another version only sold with this system. Maybe everything that ships to the US has °F, the rest of the world gets °C. is +/- 1°C, which is about +/- 2°F. This means one thermometer can read 27°C and the other read 25°C AND IT IS IN CONDITIONS! If you don't like that tolerance (and all thermometers are approved!) then don't buy it. Good luck finding something with tougher specs, even at 10x the price! One of the most difficult things to measure accurately is temperature. Don't expect tight tolerances for a $3 product! I found the thermometer mentioned above to be a better product (no switch, large display) AND they are cheaper at $9/4 or $2.25 each. I hate promoting another vendor's product like this in the comments section, but that's my opinion.