6 Pack Mini Digital Thermometer Hygrometer,Indoor Temperature and Humidity Gauge Meter Monitor Fahrenheit (℉) for Home,Greenhouse,Jars

CORRECT HUMIDITY READINGS- How YOU can check them:
I verified they were correct with lab approved method. You can too!Bought 6 pack, all were correct within + -2% RH ! Impressive. Make a salt shush ~ 1/8″ deep in bottom of cleaned and dried tomato sauce jar. Hot glue a paper clip/ wire hook to the inside of the lid so you can hang the device on it’s end. Kosher salt (pure sodium chloride, not iodized) slush with water in bottom will at room temps ( 68-95deg F) makes a 75% relative humidity atmosphere in the jar. Potassium Carbonate slush makes a 43% relative humidity (at 50-77degF). Hang device an inch or more above the slush. DO NOT get slush on the device! Make sure no pure water drops on the inside of jar. Allow a half hour for reading to settle in. For the small price they are FANTASTIC! (please, no questions)

Mine are pretty accurate, Price is good, & I’m happy so far.
I wanted multiples, because I work in multiple rooms – 1 each for the basement, garage, & workshop, so I can decide more accurately, if the conditions are OK to work with glues, resins, & paints, before I find out the hard way.I also wanted to know why I’m freezing in one room, & overheating in the next, so this will fix my wondering if it’s me, or the room.PRO’s:* Six mini thermometers AND Humidity gages for $15. bucks, is a good price to me.* Mine all read about the same: +/-1% on the humidity, and +/- 0.15 degrees on temp.)* Easy to read the Humidity, a bit harder to read the Temp – number size is pretty small.* Easy change 2 button batteries (AG13), but the ones in them are working fine for now.* Professional looking – if you’re aiming to install it in a stand of some sort.CON’s:* You can only really see them at, or near eye level & within arms reach.If you look at them at an angle, the screen either appears all gray, or all 8’s.* They don’t have any magnet, or sticky tape on the back, so you just have to sit them on the counter, or build them into some sort of stand.These actually look like they were meant to go into some sort of panel. They seem to have spring clips on the sides, & a slight lip surrounding the box, which would prevent it from slipping through the hole, & leave a nice finished edge. I’m thinking I’ll be doing something like that, in wood, or cardboard, or something – just to hold it in a good place on the wall.These are pretty small, so I’ll bet they’re pretty easy to knock off the shelf, if you don’t adhere them to something.I’ve only had mine for a day, but they’ve been remarkably well synched thus far. I’ll be spreading them out tomorrow, if they continue to hold these tolerances through the night.I’ll update, if they go awry too soon, but at this price, I’m not expecting miracles forever. : )

Heck yeah good would highly recommendation
Great still working years later on the same battery actually need to buy a few more these work well. Great at keeping the temperature measured properly according to my temperature gauges, battery life like instates is awesome , size is good few inches, looks nice, does not have bluetooth good old school analog, very clear so it is easy to read.

Ok for the price. I would purchase again if I had to.
A few of the hydrometers were inaccurate but overall they work well. Down side is you get 4 good ones and 2 duds.

I use these in some 3D printed guitar case humidifiers and they work fine. Mine came with batteries installed and active so you may wish to install new ones. Other than that, no issues. They all read with +/- 5% which is all you can ask of a cheap sensor like this. I am satisfied.

I keep them in the jars for all of my summer grow and they’ve been working excellent, none read any different from the next. All accurate

Good size but I need to have it in Celsius.