I guess I lucked up cause I got in indoor/outdoor hygro from Wally-world in my coolerdor, and it's spot on 65% (with 65% beads). Salt tested perfect.
Actually...with the Bovida calibration kit, it only takes 24 hours. If the Xikar hygro read 72% instead of the expected 75%...you just adjust it 3 clicks clockwise so that it reads 75%. After making the adjustment, you can recheck it using the salt test again. I've got two Hygroset II's which I believe are the exact same hygrometer as the Xikar, except that they both came with Bovida calibration kits. I've only had mine a couple of weeks, but I couldn't imagine using anything else. :thumbs: