Hobbes FM-257835 SmartFiber Fiber Optic Power Meter tests for standard optical power from +3 to -60 dBm dynamic range with three calibrated wavelengths; 850nm, 1310nm, and 1550nm. Hobbes FM-257835 comes equipped with a 2.5mm universal adaptor which can be used for all the most common fiber interfaces such as ST/SC/FC/FDDA. It is suitable to test both single mode and multi-mode cables. With an optional 2.5mm to 1.25mm adaptor, users can even test for 1.25mm fiber cables. Hobbes FM-257835 SmartFiber Meter can also send analog tone signals (270Hz, 1KHz, 2KHz) simultaneously for identification purposes.