Portable 1/3 Octave Digital RTA for Auto Sound and other high dB SPL measurements *Portable 30 channel digital 1/3 Octave Analyzer. *DSP30A microphone measurement range is 65dB to 160dB. *Captures full 85dB window with scales from 1/4 to 5dB. *Filters exceed ANSI specs. *Comes with RS232 computer interface.