This is the Hobbico Mini Digital Tachometer with LCD.
Measures the revolutions per minute (RPM) of RC aircraft propellers
with 2-9 blades
Measures 0-99,999 RPM
Blue backlit LCD display is ideal for use under any lighting
conditions, displays number of blades setting, peak measured RPM
and dynamic RPM
One year limited warranty through Hobby Services beginning at date
Mini Digital Tachometer with Instructions and CR2032 Battery
Input Power: 3.0V CR2032 LiMn battery (included)
Power Control: Pushbutton with automatic inactivity shutoff
Display Control: Pushbutton
RPM Range: 0-99,999
Propeller Type: 2-9 blade
Display: LCD with blue backlight
Case Size: 3.54 x 2.01 x 0.63" (90 x 51 x 16mm)
Weight: 1.45oz (42.8g)
Always keep the tachometer and hands away from rotating propellers.
Read the enclosed instruction sheet in full prior to use.