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CENTER-392 Integrating Sound Level Meter IEC 61672-1 class 2 Back-lit display✦Kd | eBay
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What is the difference between Class 1 and Class 2 sound level meters?
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Class 2 sound level meter - All industrial manufacturers
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Professional Integrating-Averaging Class 2 Sound Level Meter with Data Logger and Noise Analysis Software: Amazon.com: Industrial & Scientific