Rotational speed testing instruments monitor machine health by counting revolutions, or pinpointing issues before they cause downtime. Tachometers measure rotational speed with the use of light, lasers, magnetism, or direct contact with the spinning component. Tachometer sensors are permanently affixed sensors that detect objects, motion, or the revolutions of a machine or tool. Tachometer accessories protect, connect, support, or adapt tachometers to allow measurement of a variety of objects. Stroboscopes produce rapid, even pulses of light which allow detailed inspection of a machine component while in motion. Stroboscope accessories enhance visibility or functionality on a stroboscope.