The Planet Waves Humidity & Temperature Sensor is a precision-designed hygrometer that digitally indicates accurate relative humidity levels ranging from low (under 20%) to 99%. Temperature is displayed in either Fahrenheit or Centigrade, ranging from -32°F to 122°F (-35C to 50C). The HTS includes a programmable set point, as well as a memory feature that indicates date/time of the highest & lowest temperature/humidity levels the instrument has been exposed to. Get one for each of your instruments. It’s a wise investment to properly install and use a Planet Waves HTS and a humidifier in each of your instrument cases. Accurately displays temperature and humidity levels Memory feature indicates recent high and low levels Built in clock and calendar Get one for each instrument case