功能概述：
Long Wavelength Range: from 1200nm to 2400nm
High Sensitivity: down to -70dBm
6 wavelength resolution settings: from 50 pm to 2 nm
7 level sensitivity settings: down to -70 dBm
Wide measurable level range: from -70 dBm to +20 dBm
Wavelength accuracy: ± 0.05 nm