JOSMAX 4-in-1 Decibel Meter Sound Level Reader + Digital Clock + Humidity & Temperature. 11 inch Large LED Display Wall Mounted Classroom Noise Decibel Reader Meter, Sound Meter, DB Meter & SPL
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Decibel Meter Wall Hanging Sound Level Meter 11 inch Large LED Display Noise Temperature Humidity Meter with Alarm Icons Indicator Wide Applications for Classroom, Studio, Home, Factory: Amazon.com: Industrial & Scientific
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