Features 1,It has 6 light wavelengths to choose from, 850nm or 1300nm or 1310nm or 1490nm or 1550nm or 1625nm. 2,Universal optical interface design, it supports for FC or SC or ST, and can convert between absolute power dBm and relative power dB. 3,Ergonomic design, its compact structure is specially designed for installation, operation and maintenance of optical fiber, and is not restricted by the use of space. 4,Simple operation, you only need to follow the instructions on the operation, it can easily detect the accurate value. 5,A wide range of applications, suitable for fiber CATV engineering, fiber optic sensing research, optical device production, fiber optic device research and other fiber optic projects. Specification Item Type: Optical Power Meter Model: GM65 Material: ABS Battery: 2x1.5V AAA Battery (Battery Not Included) Uses: It is suitable for fiber CATV engineering, fiber optic sensing research, optical device production, fiber optic device research and other fiber optic projects. Power Measurement Range -70dBm-and6dBm Standard Wavelength 850nm, 1300nm, 1310nm, 1490nm, 1550nm, 1625nm Display Resolution 0.05 Measurement Error When ≥-48dBm, ±2dBm When ≤-48dBm, ±3.5dBm Use Environment≥-48dBm Temperature Range: 0-40℃ (32℉-104℉) Humidity Range: 5-95 percent Use Environment ≤-48dBm Temperature Range: 0-32℃ (32℉-89.6℉) Humidity Range: 5-80 percent Storage Environment Temperature Range: 0-40℃ (32℉-104℉) Humidity Range: 5-95 percent Package List 1 x Optical Power Meter (Battery Not Included) 1 x Manual Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.