General Tools LCR318 Miniature Temperature and Humidity Monitor The tiny size of the General Tools LCR318 Miniature Temperature and Humidity Monitor is perfect for cigar and tobacco humidors and instrument cases The tool simultaneously displays indoor temperature in Fahrenheit only and humidity The thermometer and humidity meter feature a large LCD display for receiving easy read-outs The instrument has minimum and maximum temperature along with humidity memory Comes with a low battery warning, and it can stand on its own, or mounted; the power sources is one LR44 battery that comes included