Brand: Planet Waves
The most accurate digital hygrometer we have found for use in your guitar case, or the room where you store your guitars. This is a VITAL piece of equipment for the conscientious guitar owner. It is programmable and the digital display will indicate when it is time to add humidity to your instrument's environment. Also acts as a thermometer and clock/calendar. Inexpensive enough to have one in the case of each of your prized instruments. Uses one CR2032 battery (included).