I don't necessarily trust a mobile app to measure properly, so a special tool like this gives me more confidence. I'm working on a landscaping project that will include an outdoor sound system, so I wanted to test the noise levels from different angles and in different areas. It's easy to use and effectively measures sound levels, although I don't know how accurately. However, from what I've measured, the sound levels seem correct to me, so I'm glad I have this tool.
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