| The 'flip' kind is mechanical and runs (usually) by spring motor. In time, this mechanism can become worn (if you practice as much as you should!) and will 'flip' in uneven time... like a heartbeat, only groovier.
Digital is better, no moving parts. Try to find one (like a Franz) and has a blinking light that will catch your eye.
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Never confuse beauty with things that put your mind at ease. -Charles E. Ives
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