The Audio Control Industrial SA-3050 is measurement-grade,one-third octave real-time analyzer designed for audio signal analysis.The SA-3050offers the following features:• 30 one-third-octave bandwidth filters.• Fourth-order filters conform to ANSI Sl.11-1971 Class II, type E standards.• Internal pink noise source.• 9 X 30large-format LED display with 1 dB Resolution.• Six internal memories with battery backup.Signal Input: microphone, phone jack, BNC Connector • SPL bar graph display • 92 dB display range.• Signal input from balanced microphone input, balanced phone jack or unbalanced BNC connector.The unit is in very good condition considering its age. Front panel is clean with minor scratches on case. Unit was stored/used in a smoke free/ pet free environment. Unit was tested for functionality 0nly - mike input/output/display. Includes accessories as shown.