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TestHelper SW 525A Sound Level Meter Tester 30 130db Large Screen Red LCD Display Wall Hanging Type Decibel Noise Measuring with Alarm (Sound Level Meter) auspowers_batchfive Pink (Rose Gold) Instruction Stick B07V23QJ82 Pink (Rose Gold) Instruction Stick the metal plate to back of the phone or case Clean up the mounting position on the back of the phone or case A FUN WAY TO EXPLORE THE SCIENCE OF POLYMERS: Within seconds Usually in a very quiet room can be hangged on the wall DC 5V 1A micro USB power supply Specifications: Model: SW 525A Measurement range : 30 ~ 130dB (dB) Accuracy: +1
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