Features: * 3 functionscombined: rotation/length/speed * 2 testing modes: non-contact (laser) + contact * dynamicdural display: MAX (or MIN) value + last measure value * wide measuring range: 0~99,999rpm ( 5 digit LCD display ) * automatic data-hold after TEST button is released * automatic data display on LCD after TEST button is released MAX (or MIN) value + last measure value are displayed on LCD after TEST button is release * auto power-off after 5 minutes no operation * with LCD backlight * with BUTTON pushing buzzer (one time buzzer tells you have pushed the BUTTON one time) * with LOW power-supply indication on LCD * 1 patent approved