I just watched the video of this tach posted above on youtube. I dont care what they say the refresh rate is. It is way to slow for me and my likings.
I agree its a little slow, plus it doesn't store max rpm. I was just pointing out another "moderately priced" tach that seemed extremely suitable for chainsaws.
I personally could not afford an $85 tach for one chain saw.
But like RobertN mentioned, I've got a Fast-Tach that I can use on my car's, trucks, motorcycles (if I ever get the bikes rebuilt).
But to me the clinker in buying what was regarded as the best tach for the buck for chainsaws was when I went from 1 Stihl 021 to a Stihl 021, an efco MT3600, and a John Deere CS62 in 3 weeks, and then later acquired 2 Stihl 660's.
Especially with the 660's, which are both modded, it seems important to "tune" them for different bar lengths. I've got 24", 28", 32" and a 42" bar, and although I try to tune by ear I like the tach for setting the low idle and checking the WOT in the cut.
Now if you really wanted to save $$ there was a thread somewhere on AS that someone showed how to hook up a DM as a tach. I just got one from Harbor freight for free. Looked like to much trouble for me, as in trying to figure out how to put reflective tape on something to use an optical sensor, especially in the cut.
I need something I can pull out of a pocket w/ gloves on, point and shoot.
Others may be willing to put up w/ wires to save $$ or spend $$ to measure the speed of a PC fan, each to their own.
. And verify his tractor tach. And the motor on the clothes dryer. 