Specifications

1. It looks fancy and is compact in size, Very handy to use
2. Multiply the readout by 10 for final rpm reading.
3. It measures 2-9 blades prop rpm
4. It shows 4 digits in a 0-99,999 rpm range
5. It comes with a replaceable 3V LITHIUM Battery
6. There is an auto shut-off function (no signal detected in 5 mitutes)
8. It needs a little electronic power (20ua) when the TACH is not in use.
This may prolong the life of the battery