ThlevelHygrometer Thermometer Digital Monitor Humidity Meter Gauge for Humidifiers Dehumidifiers Greenhouse Basement Babyroom 6 Pack

They appear to work pretty well, not exact but like with any devices like a steps counter it's more of a guideline. Ended up changing my mind and returning them.

They all come with batteries and switched on when they arrive. All of them had the same reading, good calibration. Can assure they are all correct but seems to be a good indicator nonetheless. Gave 4 stars as there's no way to turn them off without removing the batteries. It does the job anyways. I'm using it for a 3D printed dry box.

If you just want a readout without weird smartphone linking and other superfluous features, this is the product.Measures within the tolerances advertised. The three side by side don't deviate more than a couple of degrees.

Good value for money but placed them in a row when I got them and left them for an hour. They had all different readings which they say +/- 1degree but you would think in the same location they would all be the same. Anyway I don't need them them to be too accurate so for the price okay.

Nice units.One out of six was different to the others by ~10%.Otherwise a success.

With any measuring device, you're going to get a little variance between each measurement. After all, none of them can occupy exactly the same space at the same, but we got our 6 out and laid them in roughly the same place for 24 hours and noted very little difference between them all.The large number is humidity, expressed as a %, and the smaller number is temperature in centigrade. We purchased these in an attempt to try to get on top of an overly-insulated, south-facing house (we hit 40c last July) which we've just installed air con in and wanted to test its effectiveness so we could learn when we needed to turn it on and how long to leave it on for.These little things have been perfect. they sit discreetly on shelves and demand no attention until you fancy checking up on what's going on. At first we thought that 6 would be far too many but, actually, you end up putting them all over the place when you're trying to see where the cooler air reaches.Genuinely, I wish I'd found these years ago.

Great product does job nothing fancy

Cheap thermometers, but one of the only 2 of them show approximately the same temperature and humidity values. (just 1 degree difference) The third one shows 5-6 degrees less then the other two.