Product Details:

Standard Tiny-Tach™

RPM to 9,990.
Updates every 2.5 seconds.
Standard wire length is 6 feet.
Estimated battery life is 5+ years — not replaceable.
One year warranty.

Used on engines with one spark firing on each revolution of the crankshaft.
1 cylinder 2 stroke (reads 1x / revolution) Briggs, Kohler and Honda type engines.
4 stroke with electronic ignition and no points.
2C can also be used on 2 cylinder engines where the cylinders fire 1X per revolution.
Note 1: Engines frequently referred to as a "4 stroke" may not be a true 4-stroke because they fire on the exhaust stroke as well – requiring a 2C.
Note 2: You cannot reset, hours will accumulate.