Incredibly precise and handy tachometer for vehicle maintenance and more instrument for measuring rpm or speed on wheels discs or surfaces the measurement is carried out either via a contact wheel or optically by a laser reader class 1 the 5 digit lcd display is clear and easy to read the meter has a min max memory for later use features non contact speed measurement contact speed measurement dimensions approx 217 x 84 x 43 mm weight approx 265 g measuring range speed e speed e