The PRO-OTDR was designed for FTTX applications. It can test the length, fiber loss connector loss and other physical characteristics of fiber. With up to 65534 sampling points, it can locate events on fiber cables precisely. It is really the tool of choice for FTTX application installation and maintenance as well as for fiber R&D and single mode network testing.
The PRO-OTDR-SM was designed for the low budget. It can meet the the basic demand in real testing. With the smaller size and weight, it's the optimal units for field testing.