EXTECH, 3 1/2 in Digital With Backlight and Analog Bar Graph, Sound Level Meter NIST Certificate - 8UTP0|407750-NIST - Grainger
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Extech SDL600Digital sound level meter with integrated data logger, Larm-Messgerat31.5 - 8000 Hz IEC EN 61672-1 class 2 | Conrad.com
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Extech SL400 Sound Level Meter, Noise Dosimeter, Compact, USB, OSHA/MSHA/DOD/ACGIH/ISO Compliant | Techni-Tool
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