Title: Useful for monitoring guitar case humidity
Review: I purchased this (plus the calibration kit) due to suspicions of the accuracy of an analog hygrometer that came in an acoustic guitar case I recently purchased. After calibration (it was only off 2.5%) I've now determined the analog hygrometer is off by 40%! This gadget probably saved me from some guitar damage had I trusted the cheap analog hygrometer and unnecessarily increased the guitar case humidity.
Is this product review negative?