Review on 🌡️ JEDEW 2-Pack Mini Hygrometer Thermometer: Ultimate Digital LCD Monitor for Indoor/Outdoor Humidity Meter, Temperature Control in Humidifiers, Dehumidifiers, Greenhouses, Reptile Habitats, Plants, and Humidors - Fahrenheit(℉) or Celsius(℃) by Brian Page

I use these little things in guitar cases. They are plain and simple and do the job I wanted them to. No fancy gimmicks, and because they're so small, I can fit them almost anywhere in the case. I glued some felt dots to the back, being careful not to touch the pickup so it could sit next to my guitar's body. Without scratching the finish or paint. Just a note: one of the two came with a dead battery. But we all know where to get extra batteries. All in all these little guys are great value for money and I will recommend them to other guitar lovers.