MusicNomad HumiReader Hygrometer, Humidity, & Temperature Monitor (MN305)

Accurate sensor measures humidity and temperature every 20 seconds Innovative 3-in-1 design for sound hole, Case, or room Hang from strings to monitor sound hole or use case holster to securely use in instrument case Reads Fahrenheit or Celsius and displays maximum and minimum levels Hygrometer comes with a long-lasting AG13 battery