Review on Versatile 16 Pack Mini Hygrometer Thermometer: Accurate Digital LCD Monitor for Temperature and Humidity in Various Settings by Grant Zeeb

I bought a few of these but now unfortunately I have to return them. They started to work well at about 50% relative humidity and room temperature. I use this to dry dental floss, so I put it in a dryer box and watch the relative humidity drop for a couple of hours, which is typical. However, once the relative humidity reaches about 25% RH, the readings start to behave strangely - they start jumping between the low 20 RH readings and the high 20 RH readings, flashing from 10% to 20% RH, i.e. white I don't know what's true. Over 75% of these hygrometers do this, which is a terrible statistic. After the return I have to take care of a replacement. It has a good price, but the performance of the hygrometer leaves a lot to be desired. Carefully!