I either suck at calibrating with the salt test or its off by 10-15% or my box stopped holding humidity. For a while when I'd open my humi it would read 68-70% over the past week its been reading less than 60% so I decided to test the hygro maybe the consistency is off on the salt but it got to like 65% after about 8 hrs. Not sure where to go from here. Its a digital thermo/hygro from a pet shop an it cost about 20 bucks the same as the rest and I'm using the crystals for humidification. Everything has been good until recently not sure which out of the 3 could be the culprit.