This is the perfect Mini Power Meter! Check out the FPM-50S Mini Optical Power Meter, (-50 to 26dBm) The Jonard Tools Mini Optical Power Meter is perfect for measuring both the absolute optical power and relative power loss in fiber optic cables. This power meter features the following: - Measures a wide variety of wavelengths from 800-1650 nm, with a mere 0.01 dB resolution - Measures 10 preset calibrated wavelengths with high precision to determine absolute or relative power - LED screen is ba