Okay.........okay..........I have received two Western Digital II hydrometers. Both of them, in the insructions say they are guaranteed to be accurate to within 1 degree, plus or minus. They strongly recommend against using the salt calibration test. In fact the wording is something to the effect........."if anyone suggest the salt test.....immediately run from that person!" I also have two of the indoor/outdoor hydrometers/thermometers that Wal-Mart sells (with the probe) that I HAVE done the salt test on, after clipping the wire probe off. Both of them are within plus or minus 5 degrees of 75 RH. As long as you mark them with the degrees off I have found that they work extremely well. To me, Igloodors are the ideal way to store cigars long-term. Once you establish the RH you want to keep them at, it doesn't vary much except briefly when you check on the cigars (I occasionally have to look at them). The best solution I've used so far is the 50/50, PG/distilled water solution (don't be so damn cheap; you're only talking about a investing a buck for a gallon of distilled water to preserve several hundred dollars worth of cigars). I'm going to give the Climmax beads a try (they're supposed to be much more precise and require less attention, even, than the PG/distilled water) and I'll report back to you how it does. Remember, as a general rule cigars are much more durable than you might think, and will be pretty forgiving of all but the most gross mistakes. Just my thoughts.................