This is the instrument for the user whose primary focus is compliance or the acoustics specialist who needs to gather extensive data quickly at minimum cost. The CEL-320 provides clear, complete and accurate information for communications with regulatory agencies and good record-keeping. The 320 comes with an OSHA setting or you can program your own setups from the software.  Operation is simple -- turn it on, calibrate and go.  For use as an ANSI Type 2 integrating sound level meter, just replace the microphone with the SLM adapter and select the mode, range and weightings for your application. Calculates TWA (time weighted average) user selectable. Direct printout capability.