Agilent / HP E5970A Handheld Optical Power Meter meets the requirements of network installation and maintenance teams of fiber optic links, who want rugged and lightweight fiber optic test equipment that combines high performance with ease of use, and reliable operation. Features Wavelength range 800-1600 nm Measurement Range +11 to -70 dBm Total Uncertainty +/-5% =/-5 nW Calibrated Wavelengths 850, 1300, 1310, 1550 nm Fiber Type 9/125 µm to 50/125 µm Unused.