Optical attenuator

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Optical attenuator; optical testing machine/ equipment:
1.multi-wavelength application;
2.automatic power-off, low battery alarm;
3.4.5bit liquid crystal display;
4.step length setup correspondingly: 0.01dB, 1.0dB, 10dB;
5.memory of current setting;
6.attenuation value set up continously

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