Hi Ron, I found some interesting urls when I did a search for mechanical impedance wood. http://www.ndt.net/article/v04n11/bucur/bucur.htm Calculators? http://www-sci.lib.uci.edu/HSG/RefCalculators1A.html Meters? http://www.hazari.com/lutron3.htm Regards, Don Rose, B.Mus., A.M.U.S., A.MUS., R.M.T., R.P.T. Tuner for the Saskatchewan Centre of the Arts drose@dlcwest.com http://donrose.htmlplanet.com/ 3004 Grant Rd. REGINA, SK S4S 5G7 306-352-3620 or 1-888-29t-uner
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