Specification:

²  It looks fancy and compact in size and very handy to use.

²  NEW tachometer with data memorizing and low voltage alarming function

²  It measures RPM of 2-9 bladesprop.

²  Multiply the readout by 10 for final rpm reading, it shows 4 digitals in a 10-99,999 rpm range

²  It comes with a replaceable 3V Lithium battery.

²  There is an auto shut-off function after five minutes when no signal received.

²  Display and memorize the maximum rpm value.

²  It needs a little electronic power (20uA) when the tachometer is not in use. This depends on battery’s capacity for life of battery

Kindly Remark:

-Please try to keep the tachometer stable when measuring data, because the radial luminance is induced by hall sensor 

-It’s normal to find the data of tachometer floating when carried it by hand.