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The way to tune it best is to use an oscilloscope and a callibrated electronic tone source. The tuning fork vibrations (via a microphone) are displayed on the Y axis and the standard tone is displayed on the X axis. The up/down - backwards / forwards motion of the spot will be a steady circle / ellipse / diagonal line when the tuning form is in tune. When its frequency is a bit out, you get a wiggly set of closed curves. You keep filing until you get your steady pattern.http://www.youtube.com/watch?v=OBmhoGRDuOEhttp://www.youtube.com/watch?v=DXpntnHxNZQ http://www.youtube.com/watch?v=sYYyJvVFj4Qpretty pictures / soundsAlternatively, you can do what a piano tuner does; he listens to the 'beat' between the fork and the standard as he adjusts the tension in the string. When it disappears, the fork is forking well in tune.