LinkDm 12 Pack Mini Digital Electronic Temperature Humidity Meters Gauge Indoor Thermometer Hygrometer LCD Display Fahrenheit (℉) for Humidors, Greenhouse, Garden, Cellar, Fridge(Multicolored)

I have 15 of these devices and they are all over the place with their humidity readings. There is a 10% Delta across the devices. Do not buy.

i ordered TAiWEI 12 pack of mini hygrometers a while back and i loved them so much that i bought another set of 12 except this time it was from LINKDM and they were different colors and on top of that, they were 6 dollars cheaper so i gave them a try. i received them with batteries in them already and i can tell you right away that the humidity readings were much different then the TAIWEI so i let them sit overnight. Then the next morning i compared them with TAIWEITAWEI readings: 40%, 39%, 40%, 39%, 39%, 41%, 39%, 40%, 39% ,38% ,39%, 38%LINKDM readings: 44%, 43%, 45%, 43%, 44%, 43%, 43%, 45%, 42%, 44%, 43%, 45%they all agreed upon there own brand so i pulled out my lacrosse technology weather station which showed 42% i then did the same thing with temperatureTAIWEI readings: 74.1, 74.3, 74.1, 73.5, 74.3, 73.4, 74.1, 74.1, 74.6, 74.4, 73.9, 74.6LINKDM readings: 73.5, 73.7, 73.2, 73.9, 74.1, 73.7, 73.0, 73.9, 72.8, 73.0, 73.7, 73.4lacrosse weather station reading: 73.9these are very accurate for the price but if your going to buy cheap thermometers i suggest buying 2 of different brands and find the average temperature and humidity between the 2 and you should get a accurate temp and make sure both of them are both between 2.5 degrees within each other. Also, the TAIWEI thermometers have the ancient 7, you know like the hook at the top that goes down, the LINKDM thermometers do not have that feature.

At the factory, they must simply group together 12 units that read close to each other - completely inaccurate.Using (10) brand new 62% Boveda humidipacks in a large ziplock bag, I placed the 12 units inside the bag and left for 48 hours.Results were:53% (3 units)55% (4 units)56% (4 units)58% (1 unit)Leaving them in the bag another 24 hours produced the same results. These are basically unusable unless I indicate the variance on each one.I purchased 12 of these before and got results between 59% - 66%. I figured another 12 would give me enough accurate units to use, but I was completely wrong. As I said, they must just group a dozen units together that read close to each other, because they're certainly not calibrated to the actual relative humidity!EXTREMELY DISAPPOINTED!!!

It depends upon what your intended use will be. It's inexpensive, but fails for accuracy. I wrote a review for a similar product, and this product has the same problem. I set up a small table in my garage, and placed two of these adjacent to one another on a plastic surface, with a separation of about 4". Logically, they should have displayed the same temperature and relative humidity values. The values were considerably different.I wouldn't use these to determine an exact (or even close) temperature or relative humidity. They are acceptable to get an indication of change : "the temperature is xx.yy degrees, and has been falling since I started the experiment, so the freezer is working". One of the 12 units didn't work upon receipt. I removed the batteries from a unit that was working, and inserted the batteries into the unit that wasn't working - no reading, so a set of dead batteries wasn't the problem. The cost of the units was so low that I didn't even bother whining to Amazon about it. I gave the product 3 stars because they do serve a purpose (not the purpose for which the product was originally purchased, but hey ... they were seriously inexpensive, and while far from lab quality, they'll give you an approximation - good enough for most purposes. If you go outside on a winter day, does it matter if the temperature is 41 or 37? The rate of change IS important, and these will provide that information :)

As you can tell from the pic, the readings are close enough except for the one on the bottom. It was glitchy right out of the box. However, after taking the batteries out and putting them back in, it works fine. So, for the cost I am quite happy with them!

They are -6 or more off right out of the box across the board. These are the worst product I’ve bought on amazon for this reason. They don’t just not work these are giving you bad enough information that you might lose things that require you to know the humidity. Why even make something that is this far off what is the use of this product?I’m lucky I check my hygrometer’s before I put them to use and I will be returning them.

I don’t think you can beat these for the price. I added a picture that shows that they’re all within +/-1 of the control thermometer I used. Some people complain about the range but I plan on using the two thermometers with the highest spread and putting them together in the incubator I’m using them for. They’re obviously not clinically accurate but if that’s what you need you shouldn’t be shopping in this price range.

I like to keep my flower between 55 and 60% RH after curing. After I started using these my stash is easily maintained at the RH I enjoy the most. The price of these makes it easy to put one meter per jar. I like using these better than using the Boveda humidity packs to regulate RH in storage. (if it gets too dry I can add a finger of a leaf to re-hydrate just enough)

Ya vienen con las pilas puestas y no se cuanto tiempo han estado así, entonces es posible que se agoten pronto y si dan lecturas diferentes todos pero no es mucha variación