Product review (2 stars): Not Wild About It
I haven't had much luck with this hygrometer. It looks great, the controls are easy to use, but there are two drawbacks. First, it doesn't read the humidity correctly - not even close, in fact. Second, it's not adjustable. I was getting wacky readings after installing it in my guitar case. I tried the "salt test" without being able to get consistent results. I finally bought the&nbsp;<a data-hook="product-link-linked" class="a-link-normal" href="/Boveda-One-Step-Calibration-Kit/dp/B000A3UBLA/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Boveda One-Step Calibration Kit</a>&nbsp;to test it. Despite following the instructions and leaving the unit in the bag longer than required, I never got a reading higher than 69%.

On the other hand, the&nbsp;<a data-hook="product-link-linked" class="a-link-normal" href="/Quality-Importers-HygroSet-II-Round-Digital-Hygrometer-for-Humidors/dp/B000H6CZQE/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Quality Importers HygroSet II Round Digital Hygrometer for Humidors</a>&nbsp;(which I bought when I started having doubts about the Planet Waves device) managed a reading of 76% - only 1% off the test target. And I was able to adjust it to read 75%. It's possible that the Planet Waves hygrometer is optimized for accuracy at lower humidity levels - 45% to 50% for guitars rather than 75% for cigars. However, without a way to test and calibrate the Planet Waves product, I have to conclude that the HygroSet II suits my needs better.