10-Pack Mini Thermometer Hygrometer, Small Digital Electronic Temperature Humidity Meters Gauge Indoor LCD Display for Humidors, Greenhouse, Garden, Cellar, Fridge, Mason Jar

Made well, works great does the job.....

They seem to working but I did not like the fact that they were turned on in the box, all of them. How long were they on shelf running on the battery? How long it will last is to be determined.

I like the accuracy and size of these devices and the display is easy to read. What I didn't like was that the packaging was flimsy and several device boxes were crushed in transit. Most importantly, all of the devices were already activated at arrival, so of course the batteries either drained or failed right out of the box. Who stocks electronic devices without disabling the batteries with at least a plastic film strip to deactivate the batteries. I sent them a message requesting they send me replacement batteries. I will update my review accordingly after they respond. Update 10/26/21: No response from this vendor.

You can put 3 of these in one quart size mason jar and they will give you wildly different humidity readings. Plus the box I received had clearly been previously opened and was short by 4 units. For the money not worth the hassle of returning, but save yourself the few bucks and find a better option.

At $2 dollars a piece they get the job done. Do not let the 3 slits in he back be covered, that is where the relative temp/humidity sensors are.

No two are the same junk they are junk Amazon sells them from China

They were all within a fraction of a degree from each other on temperature, and the humidity reading was within 5% of each other (max-min difference = 5%). So far, batteries are ok, but I don't expect them to last long. I keep a pack of replacement batteries at the ready, and I suggest you do the same.

Good Quality meters . all 10 work and we’re calibrated @ the sameRH/temp,out the box that was within +\- 1 Of my Calibrated monitors great buy

Item as stated

So cute. I sticked them on the wall each room,so that I can know the temperature, and adjusted the air conditioning accroding them

no

Works perfectly. No issues whatsoever, and all are fairly consistent.

+/- 2 rh accuracy.