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ShopHDE has the Digital Photo Tachometer for $18 - $3 off with coupon code benjunk76ght [100 uses] = $15 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.
$15
I have this. It works great. I use it to set up the carb on my ruckus.
to determine engine rpm? where do you take a reading?
I take off the belt cover.
I had one of these years ago, before lasers, and they work really nice. My old one was just a strobe light type. Usually they have adhesive stickers to place on whatever you want to check, might get away with just a white line if you're real close. I've used the flywheel or pulley shaft. It also works great to make sure you're playing those old LPs at exactly 33 1/3 rpm
I thought it's to measure how fast my head spins when reading about digital cameras...
-- Okay, what exactly does this do and what's it for? Ben's poorly explanative description only reads, "Measures rotational speed with a visible red light beam."
pretty good deal, cheapy at Tool harbour is $30 on sale, so ifit works and is half that price, not a bad deal.
it's basically a hand held tachometer, good for checking the speed of any motor or anything else that turns.