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FNIRSI FDM01 Digital Noise Decibel Meter, Handheld Sound Level Measuring Instrument, 30-130dB Measuring Range Ship from::China These casual solid long pantsHighlights Dual Adjustable Detection FNIRSI FDM01 noise decibel meter features two sensitivity modes. You can choose 1s quick measurement which is more sensitive and can read noise changes rapidly. While the 1. 25s slow measurement is more stable and is easy access to noise levels. Easy to Use This sound level measuring instrument has 600mAh built in battery, which can be charged by Type C cable. A large screen can help you read the data quickly. The