Digital stroboscopes, or strobes, provide consistent and exact measurements of speed, including stop-motion diagnostic inspection. In essence, strobes are employed to make a cyclically moving object seem to be 'slow-moving' or even stationary.The HHT digital stroboscopes provides reliable and accurate speed measurements as well as stop-motion diagnostic inspection. A rotary encoder enables quick, precise frequency setting from 30 to 20,000 flashes per minute. A fully microcontroller based digital stroboscope is widely used visualize the vibrating strings, moving gear system, speed of motor, speed of fan, waves in a ripple tank etc.