Mini Hygrometer Thermometer 2PCS Mini Digital Humidity Gauge, AikTryee Hygrometer Indoor Humidity Monitor, Temperature Humidity Gauge Meter for Humidors, Greenhouse, Garden, Cellar, Closet, Etc

They are very accurate for the price.

Much more accurate than the analog hygrometers that came with my humidors. Its nice to have two of them. I put them both in the same humidor, and they read the exact same. Then I moved them to different places in the same humidor, and they registered the difference in humidity in different spots. I then swapped places with them, and they each adjusted to the same readout the other had in the same spot. Very pleased.

Works amazing. Helped a TON with not having to guess the % my humidity was at.

This 2-pack of combo hygrometer (measures humidity) + thermometer are small, light, and seem to work well (placing them near each other and a 3rd model of a different brand, the readings are not identical but are fairly close, within about 0.5 degrees in temp and 1–2% humidity. They are also a great value, and come with batteries pre-installed (requires 2 each) PLUS comes with 4 spare batteries (one set for each unit). The only downside is the mounting. They DO come with small pieces of double-sided 3M tape (another nice touch), BUT using it to mount them would (a) block the battery compartment on the back and (b) may leave sticky residue on your glass surface. It would be great if they had with a small loop so they could be hung or a small hole to use a suction cup. But if youre OK with that quibble and dont need perfect accuracy, they are a great value and do the job.

Have compared to other various hygrometers in a humidor, and these are spot on within 1%.

Product exactly as described, came with double sided tape pads, large numbers and easy to read; measurement are consistent between the two within 1 degree and consistent with my side of tank heat indicator strip within about 3 degrees. For the price, this is a reasonable set that will give you a good idea of temp and humidity. May not be exact, but then again... these things rarely are exact. For my purposes, the 1-3 degree difference is not a big deal. Also came with extra batteries which is a huge plus since they are little button batteries and I would have to order more. Now I can change them when they go out and go ahead and order new ones without having to take them out of the tank, see what kind, and then wait several days to get them. Would buy again.

Ok - I received the 4 pieces I ordered. Fast. See my photos - pretty damn accurate. SO NOW - I see two batteries included for EACH UNIT, even though they have good batteries already included. ALSO - Velcro strips (stick on) for each unit included. BREAKDOWN: I paid $8 for 4 Hygrometers. Shipped! Plus I got: • FREE Batteries. (4) 2-packs would cost at dollar store = $4 • FREE Velcro tape. Would cost at dollar store = $1. • Shipping = Free (How much would that cost?) *Note: Let them sit for a while before saying they arent accurate. They respond slow, but steady. For the $$? No-brainer. I mean, chances are youre checking these periodically. Not every minute. Right?

I use several of these to monitor humidity inside musical instrument cases. I occasionally check their calibration using hydrated potassium carbonate as a standard, and I have never found one more than one percent high or low. Allowing for the value of the four spare batteries if you bought them at a drugstore, the devices themselves are almost free!

It reads the temp and humidity, both consistently read the same values within 2% and 0.3 degrees when I had them next to each other. This is all I expected from these. If you need anything more accurate than you’ll probably want to spend more money. I ended up buying four more of these to place around my house to keep track of temp changes. As for battery life I have no idea, I’d assume they last pretty long since they shouldn’t use much power. They did include extra batteries which is nice.

Guitar humidification accuracy