sound level meters的參考資訊
http://www.cirrus-optimus.com/optimus_range/
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sound level meters的參考資訊
http://www.cirrus-optimus.com/optimus_range/
Measuring noise no longer requires a lot of time, training, technology & translation
http://www.cirrus-optimus.com/
Product Innovation Award for the Optimus Green sound level meter..
http://www.cirrus-optimus.com/award/