Sounds like a triple threat

The 400 Series sound level meters challenge three traditional views of noise measurement instruments: difficult to use, awkward to record data, and not versatile.
By Staff February 1, 1998

The 400 Series sound level meters challenge three traditional views of noise measurement instruments: difficult to use, awkward to record data, and not versatile. This instrument uses icons for operating simplicity, stores measurements automatically, and has a wide selection of operating capabilities.

CEL Instruments

www.cel.ltd.com