Monitor the relative humidity in your home, office or wherever you store your guitar to protect it against the adverse effects of high or low levels. Easy-to-read display shows temperature and humidity simultaneously. Built-in memory stores maximum and minimum readings. Comes with built-in tilt stand and LR44 battery. One button display of MIN/MAX readings. RH range: 10 to 99% (accuracy: /- 5%). Temperature range: 14 to 140 degrees F.