Digital Tachometer,Beyoung(TM) DT2234A Portable Mini Handheld 5 Digits 18mm Laser Tachoscope Sensor Non Contact Motor RPM Tach Rotation Speed Gauge Revolution Spin meter Revolution Counter Measures the rotational speed with a visible red light beam from a powerful LED.Best gift for father's day. High intensity class II laser measures from 2.5 - 99,999 RPM Extra large 5-digit LCD display, high accuracy of +/- 0.05% Auto zero adjustment, stores last, minimum, and maximum readings The housing has been carefully shaped to fit comfortably in either hand.