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 At 07:45 PM 1/8/2004 -0500, you wrote: >What kind of an instrument are you using to measure RH @ less than 20%? > >Terry Farrell Regards, Don Rose, B.Mus., A.M.U.S., A.MUS., R.P.T. mailto:pianotuna@accesscomm.ca http://us.geocities.com/drpt1948/ 3004 Grant Rd. REGINA, SK S4S 5G7 306-352-3620 or 1-888-29t-uner
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