The 3M™ Sound Examiner™ Sound Level Meter SE-401 IS is an intrinsically safe meter 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.
Intrinsically Safe
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)