The 3M? Sound Examiner? Sound Level Meter SE-401 is engineered to accurately measure noise levels in highly variable environments. This easy-to-use instrument calculates the average sound pressure level (LEQ/LAVG) over the run time; data log the maximum, minimum and peak values, and enables data to be downloaded for further analysis.

Key features include:

• SPL, LMAX, LMIN, Peak, LEQ/LAVG, Elapsed Time
• Variable, user-selectable data logging intervals
• Rechargeable lithium battery
• Store numerous noise surveys in memory for download
• Removable Type/Class 1 microphone
• Multilingual user interface
• 28.4cm (L) x 7.1cm (W) x 3.3cm (D) / 11.2"(L) x 2.8"(W) x 1.3"(D) (with preamp and microphone)