Stop Damage from Improper Humidity Before it Starts! Whats the average humidity in your guitars case? If you had the Oasis OH-2+ Digital Hygrometer/Thermometer, youd know precisely! Boasting an improved accuracy at the same affordable price as the original OH-2C, the OH-2+ can detect humidity levels +/- 3% between 20–80%, with a wider temperature range from 32–125°. Oasis knows that the number one cause of lackluster performance in acoustic instruments is low or high humidity — it can even damage your instrument if left unchecked in the long term. Just place the OH-2+ Digital Hygrometer/Thermometer in your guitar case, and youll know instantly what the humidity level is, helping determine when to add a humidifier. Keep your acoustic guitar at top-notch performance with the Oasis OH-2+ Digital Hygrometer/Thermometer!Oasis OH-2+ Digital Hygrometer/Thermometer Features: In-case solution for monitoring the humidity inside your acoustic guitar case Helps you monitor and maintain optimum humidity