SHIMPO INSTRUMENTS hand-held tachometers, measures the total number of revolutions of a shaft or rotating gear or wheel in automated machinery. The various models can measure and record last/max/min using up to 16 different units of measure on some models. These tachometers are designed for applications such as motor speed, conveyor speed, fan speed, length measurements that measure rpm of motors or shafts, in either contact or non-contact with Laser style combination tachometers.