Voltcraft SL-100
One centimetre here and there is really not inconsequential, use an electric measuring tool to be safe. No need to look for a power outlet, since it runs on batteries. Just get at it!
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From Amazon
VOLTCRAFT Sound Level Meter SL-100 30-130 dB 31.5 Hz - 8 kHz
£64.68
Conrad Electronic
Voltcraft SL-100 Digital Sound Level Meter 5 Hz - 8 kHz
£42.74
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