<html> Jim, There is a potentiometer that can be accessed when the battery is removed. It is has a screwdriver slot. Clockwise increases frequency and  counter clockwise decreases frequency. Terry Beckingham At 07:52 AM 7/2/2007 -0700, you wrote: <blockquote type=cite class=cite cite>John,   Do you know how to calibrate the AccuFork II?  I was told that it was a factory only adjustment.  I'd love to do it myself because mine consistantly measures 3-4 cents sharp.  Jim <dl> <dd>----- Original Message ----- <dd>From: <a href="mailto:formsma@gmail.com">John Formsma</a> <dd>To: <a href="mailto:pianotech@ptg.org">Pianotech List</a> <dd>Sent: Sunday, July 01, 2007 3:44 PM <dd>Subject: Accufork & pitch reliability - was Acufork II you want to sell? <dd>I'm glad someone else brought this up. I think my AccuFork II also has some pitch problems. <dd>Measurement a couple weeks ago with a friend's RCT showed variation of 0.4 cents, measured about five times in about couple minutes. I was taking the RPT tuning exam at Kansas City, and the day before the exam calibrated the AccuFork with the CTE's SAT III. <dd>The next day at the exam, the A4 I had tuned was 1.7 cents sharp. I had checked with both B1 and F2, and was almost completely certain the beats were the same as with the AccuFork. <dd>After the pitch part of the exam was over, I again checked the AccuFork with the same SAT. It was about 0.4 - 0.6 cents sharp, judging from the speed the lights were moving.  We didn't take time to calibrate the AccuFork then; only to move the slider to the place where it was actually A440 as measured by the SAT. <dd>Now, I passed the tuning exam with very high scores, so it was verified that I can hear beats quite well. The only thing I can think of is that the AccuFork pitch drifts, or I just didn't set the A4 pin and string correctly (not very likely). <dd>I don't have an ETD, so it's kind of hard to visually check the AccuFork. Last night, I downloaded a guitar tuner program to my Palm. It showed about the same pitch variation as the RCT. <dd>What device should I trust more? The Palm? Or the AccuFork? <dd>Is there somewhere on the internet that is a totally reliable place to get smack-on A440.00 Hz?  I'd like to figure out the problem, but don't really know which device to begin with. I suppose I could download a trial version of TuneLab, but how would I know it is more precise than the AccuFork? (Do ETDs drift too?)  <dd>Yes, yes, I know I'm talking about 0.4 cents at most, so it's not that big of a deal. But I would like to have it within 0.1 cents, if not dead on. <dd>JF <dd>On 7/1/07, terryb <<a href="mailto:t46xd8jb@xplornet.com">t46xd8jb@xplornet.com</a>> wrote: <dd>Jim, <dd>I have an Accu-Fork II which I purchased several years ago, hoping to use it as a pitch source for the tuning exam. According to my RCT it was 0.43 cents flat. If it is left turned on for about one minute, it comes up to pitch. I'll sell it for $75.00 (battery not included). Shipping would be via mail. <dd>Terry Beckingham RPT </dl></blockquote> </html>