planning and plotting
Don't know if its just me but Rod may want to add a note to the directions on the How To List. For if your battery is more than 1 year old start by changing the battery then continue with the Salt Test!
I use Xikar hygrometers and calibrated them as soon as I got them. Before I started using beads for humidification I was struggling with the damn floral foam system. Needless to say, I started to doubt the accuracy of my already calibrated hygrometer and decided to re-test them. The problem is, if you've already calibrated a Xikar and then re-calibrate it you'll really throw things out of whack and really not be able to get a good measurement. As it turns out, and I only found this out after re-reading the directions that came with the Xikar, if you are going to re-calibrate you should pull the battery to allow the unit to reset itself and then re-calibrate.