Did what I needed. It never seems to go below 30-35 decibels, but then I read somewhere online that the library is between 30-40 decibels, so it seems to be working great. A minor downside is that the instructions say it may need to be recalibrated at some point in the future, but there don't seem to be any instructions on how to do that.
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π VLIKE Noise Sound Level Meter - Digital Decibel Meter with LCD for Accurate Audio Measurement from 30 dB to 130 dB - DB Meter with A and C Frequency Weighting Ideal for Sound Level Testing
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π Hand-Held Sound Level Meter - Decibel Sound Meter, 30dB to 130dB(A) Range, Backlight Alert, Noise Level Monitor for Home, Office, Job-site
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