I guest to measure the slicon omni mic this day, we have compare two pieces of them. The one piece is good and the other one is unuseless. You only need Ohm meter to measure this part as well. Ok look at the picture below

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Nokia APAC NOL
APAC TECHNICAL SUPPORT Create Date Wilchua 17 July 2007 ASB026
MULTI PROTOCOL PHOENIX SERVICE SOFTWARE
2007.20.9.28808
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