Product Overview This portable optical power meter with red light source is an accurate portable instrument with long service time specially designed for the installation, operation and maintenance of fiber-optical network. It features fine appearance, controllable backlight display, automatic power off, supper wide testing range for optical power, high accuracy, self-calibration and universal interface. Whats more, the linearity index(mW) and nonlinear index (dBm) will be displayed in a same screen. The optical power meter can be used alone for saving power. Product features The optical power meter with red light of 10mW or 1mW features open self-calibration which could be operated by the user. With two AA batteries, the optical power meter can work continuously for 40 hours. It can work continuously if working with a red light source of 10mW, or 42 hours with a red light source of 1mW. the linearity index(mW) and nonlinear index (dBm) will be displayed on the same screen of the optical power meter. Special universal interface for FC/SC/ST, easy to transformation. Optional auto off. Optional backlight display. Optional steady/flashing red light.