Review on Goabroa Hygrometer Thermometer Temperature Fahrenheit by Adan Hudson

Small and compact digital display with relative humidity and temperature. I think it's pretty good for its value, but the RH accuracy isn't reliable. The temperature, on the other hand, seems to be relatively accurate. I used the 75% Boveda package, which I previously used to calibrate my other hygrometers, to measure margin of error. After 24 hours in a ziplock bag, out of the three devices I bought, two show +2% and one -1%. I know these cheaper hygrometers tend to have a wider range of error, so I'm not surprised. There weren't any sizing instructions so I'm assuming they can't be calibrated. Also, the item arrived with the batteries installed, but the devices were "switched on" when I opened the box, so I'm thinking depending on when the devices were made I might have a few weeks or a few years before I have to replace the battery. Don't judge what these 5 star reviews are based on, but this device is definitely not a 5 star product.