An essential tool measuring the rotational speed of a rotating object and to inspect the defect on its surface without the need to adhere any mark to reflect the light, and thereby without the need to halt the object from its rotation. Capable to provide image of single, two or multiple stillness for the vibration object, rapidly rolling object or a periodic motion object, and can also use to observe the movement tracks. It uses xenon lamp which has a very bright illumination and allows room light operation at long distance and emits an adjustable flash rate.