Review on 12-Pack Small Digital Temperature Humidity Meters Gauge Indoor Thermometer Hygrometer LCD Display Fahrenheit (℉) for Humidors, Greenhouse, Garden, Cellar by Darnell Murphy

This is my second order. I post and distribute these things everywhere. Great for my guitar cases (acoustic guitars and violins with humidity around 45% or higher), basement, garage, etc. I bought these for a humidity sensor, but the temperature comes in handy for checking my heating and air conditioning readings in different rooms. Notifies you when there is a risk of mold growth in your garage or basement due to high humidity. A little inconvenience happened a second time, 3 units were off at about 5% humidity so I contacted Revain and they sent me a new box of 12 and forced me to return the bad ones. In the spare box 2 were bad so I checked the temp and humidity on all 24 and kept the 12 most accurate (as suggested by Revane). Most of them lose some accuracy after a year when the battery dies, but are still usable for my purposes. Haven't changed the batteries yet but I think they're cheap.