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I bought a Caliber III to monitor the RH in my shop. It had good reviews and the price was right. I needed a clock so I grabbed a cheap wall clock with thermometer and hydrometer. I figured it would take a day or so for it to settle in. Well, after a week of 13-15 points difference, I decided that I needed a better analog hydrometer. So I found one that reports to use a hair. Within few hours the two analogs where within 3 points of each other, leaving the digital way below. After reading that some hydrometers are only accurate within a certain range, I decided to bring the shop's RH down to about 50% according to the analogs, hoping that the three would get closer. Nope, the digital was still way lower. Life got busy and I left the shop sitting at the analog's 50%. I watched as the top and back I had joined curl and then flatten after flipping them. It stopped after two days.

Enters JJ's post on making a sling psychrometer. The two thermometers arrived from 4physics.com yesterday. The analogs are basically correct. The sling psychrometer split the difference between the two.

For $13 and two pieces of tape, I have piece of mind and can start gluing.

Thank you JJ for taking the time to post.

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Aoibeann

Happy to know that it worked out for you Lillian. The only negative I found was that those thermometers are tough to read for me unless I'm wearing my magnifiers.

Peace of mind is always a good thing!

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JJ
Napa, CA
http://www.DonohueGuitars.com

Yes it is. Thank you.



And its good to know it wasn't just my eyes.

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Aoibeann