G.T.Power Rc Speed RPM Measuring meter Velometer ,Spinning propeller 2-9 Propeller RC Helicopter Airplane Car F01973

-To measure RPM of a spinning propeller,2-9 blades ones,memorize peak RPM datas.
-Peak RPM value up to 99999 per minute
-Sharp backlit LCD screen,applicable under poor light condition.
-220 mah removable lithium button battery included.
-Compact & extremely portable.
-Automatucally shutoff when singals are not detected within a minute.
-Weight:39g
-Dimension:90*54*16mm
1)Press "POWER"button for 1 second to power on/off
2)Press "SET" button to set the relevant propeller blades.
3)Real time RPM value shown when you make the RPM sensor point to the blades within 10cm measurement distance.
4)Maximum RPM value are displayed when measurement is finished.
5) Backlit LCD are on/off when Press "SET" button for 3 seconds uninterruptedly.