The Jonard Tools Fiber Optic Power Meter is designed to measure the absolute optical power, and relative power loss in fiber optic cables. The device is able to measure a wide variety of wavelengths, from 800 to 1650 nm, with a 0.01 dB resolution. It has six preset calibrated wavelengths with high precision to determine absolute or relative power, and it may be calibrated manually as needed. A backlit LED screen allows for viewing in low light conditions, and a 10 minute automatic shutoff helps preserve battery life. The dust-proof button design and shatter resistant sleeve serve to protect the device and ensure a long lifetime.