BarryNY Posted October 8, 2016 Share Posted October 8, 2016 Trying to calibrate the "calibrator"...LOL. I purchased the Extech RH390 Precision Psychrometer for $162. The reason I bought this is that it is one of the most accurate handheld units available for a "reasonable" price with a +/- 2%RH accuracy. It also has one of the fastest response times at under 30 seconds. And, Piggy, it can be NIST certified if you need it to be. I wanted to use this as my "control". It is really not for constant on - it's for getting a quick read of the environment it's in. Place it in the winedor or humidor and in 30 seconds you have an accurate RH% down to the tenths. I hope to use this to very quickly compare to the hygrometers that are constantly reporting. But first I needed to make sure it was reading correctly. I put 65%RH Boveda packs in a double locked ziplock freezer bag for 12 hours. We have to remember that the Boveda specs are +/- 1%RH of the stated pack RH. So a 65% pack can be putting out anywhere from 64% - 66%RH. Not bad really. As you can see in the upper middle I have my Caliber IV from my humidor. Great hygrometer with a stated +/-1%RH accuracy and can be calibrated. Showing 65% no tenths. Could be 65.4%RH rounded down. The Extech is showing 65.8%RH. All in all, I'm very pleased with this test so far.... 2 Link to comment Share on other sites More sharing options...
PigFish Posted October 8, 2016 Share Posted October 8, 2016 Looks good mate! Bravo! -Piggy Link to comment Share on other sites More sharing options...
luv2fly Posted October 19, 2016 Share Posted October 19, 2016 I have one similar I use for work. Been awhile since I checked my humidor/hygrometers. Thanks for the reminder! Link to comment Share on other sites More sharing options...
Fugu Posted October 19, 2016 Share Posted October 19, 2016 I like your approach and mindset, Barry Link to comment Share on other sites More sharing options...
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