TFA Electronic Thermo-Hygrometer

Accurate little hygrometer. I love the min-max setting.
Smaller than I expected but that means it fits in any case, even ukulele-hardcases.

Smaller than I expected but seems to work well. I use it inside my acoustic guitar case. The only issue is its hard to make it stick to anywhere in the case. The sticky pad that comes with would be fine for your room but its a problem sticking it to fur in your case. I added velcro and still have an issue. But thats no fault of the device.

I bought this to store in my guitar case. The humidity level displayed changes quickly and it's accurate from what I compared it to . I did not stick it with the double adhesive tape because it might hender the sensor accuracy and I might have problems changing the battery if it's sticked . I just leave it in the case and store it in the case compartment if I move the guitar around. Good product overall.

Got 4 of these and only 1 is deviating from the other 3.

Bought two of these and they both agree with each other on relative humidity to get within a percent or two, according to my calculations based on the larger analogue TFA thermo-hygrometer I ordered from Thomann at the same time and calibrated using the salt method.

It fits nicely I'm my shaped violin case. I compared the measurements with other hygrometers I have and It seems to be very accurate. I really recommend.

It's just fit my violin case very well. compact and fully functional

It does what it says. A simple thermometer and hygrometer.
I use it to check temperature and humidity into my guitar cover.