It is used in the laboratory apparatus of teaching about acoustics chapter of physics teaching of middle school mainly, used to measure the sound in different spread speed of propagating the mediums.

It need to use with the model J0201-1 Digital Time together, first measures the time to between travel from the sound, and the the velocity of sound must happen through converting.

Sensitivity: ＞ 10 meters (sound degree ＞ 80 dB)

Working power: 220 V ± 10%, 50 Hz