Sounding M’s, which is the ultimate series of MATSUSHIMA’s sounding level meter, can save much cost for installation as it needs only 4-core cable for wiring, doesn’t need any tiresome adjustment as it can easily be set at control unit and can be applied to various applications such as high temperature, high pressure, low temperature, explosion proof, etc... Sounding M’s as a general-purpose sounding level meter provides stable measurement with reasonable price.