This type of handheld optical power meter is a compact and an easy-to-use testing instrument for optical fiber networks, which can be used for absolute optical power measurements as well as for relative loss measurements in optical fibers. Specifications: Power test range: Type A -70 to 10dBm, Type B -50 to 26dBm (optional) Color: orange+black Wavelength range: 800-1700nm Accurancy: 5％ Standard wavelength: 850nm/980nm/1270nm/1300nm/1310nm/1490nm/1550nm/1577nm/1625nm/1650nm Display resolution: linear display 0.1%, logarithmic display 0.01dBm Identified frequencies: 270Hz, 300Hz, 1kHz, 2kHz Automatic shutdown time: 10min Battery: 2 * AA battery, 3.7V, 700mAh Item size: 120 * 71 * 28mm / 4.7 * 2.8 * 1.1in Item weight: 130g / 4.6ounce Package size: 130 * 85 * 33mm / 5.1 * 3.3 * 1.3in Package weight: 280g / 9.9ounce Packing List: 1 * Optical Power Meter 1 * English User Manual 1 * Rope