Has anyone bought and used the tachometer referenced in the link below (EBay) for tuning of chainsaws? If not any opinion on the specs? Think this thing will work? Has a 0.5 sec update rate with max RPM measurement of 20,000.
http://www.ebay.com/itm/Waterproof-...81766843480?autorefresh=true&autorefresh=true
http://www.ebay.com/itm/Waterproof-...81766843480?autorefresh=true&autorefresh=true