The electret microphone tester is used to test electret microphone's sensitivity and frequency response.

驻极体传声器测试仪是用来测试传声器的灵敏度及频率响应的。

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Generally, it is difficult to calibrate microphone sensitivity without special calibration instruments, which makes the maintenance of microphone can't be done frequently.

没有专门的校准设备通常难以进行测试传声器灵敏度校准，这个因素限制了传声器的日常校准。

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One of the biggest complaints we've had with the ContourHD line of cameras has been excessive wind noise at speed and, while the 1080p addressed that somewhat by allowing for reduced microphone sensitivity, it's still far more intrusive than on the Hero.

ENGADGET: GoPro HD Hero review and helmet cam face-off

In conjunction with being the most configurable wearable camcorder (video resolution, bit rate, lighting, and microphone sensitivity), ContourHD is now the only camera on the market to enable the user to configure their lens.

ENGADGET: Waterproof ContourHD case enables head-mounted video captures under the sea