The FI720 and FI720C are designed for nondestructive identification of optical traffic on singlemode fiber. The FI720 measures from 0 to -40 decibel relative to milliwatts, and the FI720C measures from +20 to -20 dBm. Both detect continuous-wave, live optical transmission, and low-frequency modulated tones at 270, 1000, and 2000 hertz. They weigh 71/2 ounces, are 71/2 inches long, and come with a leather carrying case.
GN Nettest
Utica, NY