Temperature & Humidity Meter, Round Stock No: 35807 ME Panel mount, Battery powered ambient Humidity & Temperature meter. Humidity Range: ~10 to 99% R/H Resolution: 1% Accuracy: +-5% Sample Rate: 10sec / 1minute Temperature Range: -20 to +50C (-4F to 120F) Power: 1 X AG13 Button Cell Mounting: Snap-in ~43mm Hole NOTE: Humidity sensing is the back of case; so mounting can affect reading.