Review on Precise Humidity Control With Xikar PuroTemp Round Digital Hygrometer, 10-Second Refresh Rate by Kevin Caldwell

Nice and accurate -- two pieces, one flat steel plate attaches to the case with double-coated tape, magnet on device allows device to stick in position in case yet be easily removed for examination or battery replacement. However, I can find nowhere in my plush-lined guitar cases that the plate with the tape on it will stick to for very long. Plan on buying a roll of your own D-C tape, preferably a 3M product, to use instead of the adhesive system provided.