MICRO TACHOMETER
1. It looks fancy and is compact in size

2. Very handy to use

3. It measures 2, 3 and 4-blade prop rpm

4. It shows 4 digits in a 0-32000 rpm range

5. It comes with a replaceable 3V 220mAH LITHIUM Battery

6. There is an auto shut-off function (no signal detected in 120 seconds)

7. When the LOW BATTERY icon is on, the battery needs to be replaced

8. It won't waste any electric power (0£gA) when the TACH is not in use.

This may prolong the life of the battery