SMARTRO SC42 Professional Digital Hygrometer Indoor Thermometer Room Humidity Gauge Pro Accuracy Calibration

I have so many little temperature things like this all over, but they are so difficult to read. I LOVE that you can just hit the top of this and it lights up for a few seconds. Great for my nightstand.

This temperature and humidity measuring device serves to confirm if the temperature shown in your A/C thermostat is true and correct and in accordance with the comfort you feel in a room.

After having this for almost a full yr, here's an honest review:The problem with anything like this is knowing if they are truly accurate or not.It's now the end of July'24. I bought a large display clock that also shows date, day and temperatureback in April. It's one that I can easily read from across the room--even in the middle of the night because it's backlit.Anyway, I've been checking the two against one another. would you believe they are almost always showing the same temperature even though not sitting next to one another, although in the same~ 250 sq. ft. room. I guess that means either they're both right or they're both wrong. If wrong, what are the odds they'd both be wrong by the same amount/temperature. I lean towards they're both accurate!.Now here's what I don't like about it:1) It's back lit --as long as you turn it on, and then it shuts off automatically. The problem with this one, although it has the backlighting, you have to touch the light icon on the top of the frame to turn it on. That means, for example, if you have it sitting on a shelf and you're in bed, you have to get up out of bed to go touch the light icon to turn the back lighting on so you can see the display. Therefore, it either has to be sitting on the nightstand right next to you, or you have to get out of bed to go touch it to see it in the middle of the night. It runs on two AAA batteries. If I were to have to change the batteries once a yr instead of every yr and half, that would be fine by me to be able to see/read it in the dark. I know some people are bothered by any light in a room, so maybe an option to either have the back lighting always on or always off. The other option would be to have a light sensor and when the ambient light in the room is dark, the light comes on and it goes off when the room gets light again-- kind of like the auto adjustment on my laptop.2) Positioning of readouts:The humidity is displayed on top and the temperature is on the bottom. I can't reverse the positions though I'd like to. I care a lot more about the temperature inside than the humidity and the top figure is easier for me to see at a distance. Living in the PNW it's always humid to some degree-- inside, my home is normally good. If it should get too dry in here during the winter, I tend to know it by the uncomfortable dryness in my nasal passages &/or a sinus headache above my eyes. Anyway, I'd like to have the temperature displayed on top and the humidity on the bottom. or have the choice of which is displayed where.3) Suddenly this evening, a gray shadow has shown up on the display when lit. It covers probably 7/8th of the display surface--only a little at the very top and at the very bottom aren't affected. However, even with the shadow, I can still read it the display. I don't know if it's simply because the batteries are old or if there's something else causing it. Hold on a sec and we'll find out. Nope! Not the batteries--something else. Those weren't even the original batteries I just replaced. Although fresh batteries made the display brighter, the shadow is still there covering most of the display. So it must be something in the digital display itself or the chip for it. Since I bought this in the summer of '23, the chip could quite possibly be one made during Covid. There have been problems with some chips made during that time when so much of the world's industries were shut down or running on skeleton crews. Maybe I just need to replace this entire unit instead of the batteries. Although this isn't one of the least expensive ones, it's MSRP was $21.95; with a sale price + a 15% coupon, I paid over $15.00 for it---about twice as much as the least expensive ones on Amazon right now. To be fair, they aren't back lit and this is. Still, I've had it for a few weeks under 1 yr and would expect to get more use than that out of any of them.I guess now, my bottom line is:: buyer beware! You may only get ~1 yr's use. If you want to consider this a throw away and replace it annually, it does appear to be accurate.

Great display. Seems to be accurate. My new go to for humidity monitoring.The first order I got (2 items) one of the screens was dim. The replacement arrived in no time at all and it was in perfect working condition.I’m in Florida and have bought dozens of these devices over the past 10 years. These are the best so far.

Great unit! You can actually calibrate these as far as humidity goes. Seem to be fairly accurate and easy to read.

I live in Ridgecrest and I have humidifiers in the house! This works very well to inform me on temp and humidity!

Just received… easy to set up and calibrate…had a different version and it just stopped working.This one has a Back lit feature that is great. Magnet, wall hang or kick stand features are a bonus. I can take traveling.

Work great!