ShopHDE has the Digital Photo Tachometer for $22.95 - $10.45 off with coupon code benmay12hu74 [Exp 6/6, 100 uses] = $12.50 with free shipping. Measures rotational speed with a visible red light beam and features extra large 5-digit LCD display with accuracy of +/- 0.05%. Shipping is from U.S. and is free for all orders.
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Hmmm... I could mod this to use as a bicycle speedo/cadence meter.
what do I NEED this for?