Speed Of Sound

Two crystal mikes one is used to start the timing and another one is used to stop the timing when a sound frequency is generated by a hammer and a metallic plate. A 3*1/2 digit display with microsecond and millisecond provision to measure the time. Operating voltage for the instrument is 9V DC. Whole assembly is fitted inside a high grade metallic sheet with ABS side cover. Two crystal mikes with a set of hammer and plate is supplied with the instrument.