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.