Specifications:
LP Vinyl Laser Speed Tachometer
Using 6MHz quartz crystal oscillator
LCD display: 5-bit 18mm word high
Resolution: 0.1PRM (rpm) (2.5 to 999.9 RPM)
Battery: AAA battery ×2 (not include)
Size:108 X 60 X 32mm(4.25*2.36*1.25 inch)(L x W x H)

Package includes:
1 x Electronic Real-time Speedometer
1 x Calibration Ruler
1 x Magnifier

If there is any questions, just contact us, we will alway be here for you.