----- Original Message ----- From: "Don" <pianotuna@accesscomm.ca> To: "Pianotech" <pianotech@ptg.org> Sent: January 08, 2004 7:27 PM Subject: Re: Zero percent humidity > Hi Terry, > > I was using an aspirated psychrometer, a barometer and a formula I had > gotten from Environment Canada (our weather office) at that time which was > as "state of the art" as I could afford. > > There is more to the story as well. The piano was a Steinway B and had a DC > system (pre bottom cover) that had been unplugged. I returned it to > service, came back 17 hours later and the pitch at A4 had gone up 13 cents. > I had no choice but to tune it at that point in time because the instrument > was to be used in a performance. > > To see the exact unit go to this url and scroll down the page. > > http://www.apsnyc.com/html/humidity.html > I had no idea these things were still available. We also still use device quite similar to this, though much older. It had been tossed out and I rescued it, cleaned out a whole bunch of corroded battery insides that got all outside and replaced the battery holder. Slower than digital but it works great and I love it. Del
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