It is a very accurate and easy-to-use portable Wandermeter, designed for wander measurements on E1 clock and data signals (2.048 MHz/Mbits/s). WM-11 is a multi-application synchronization testing tool for a multitude of data rates in SDH, PDH, SONET, Video and frequency reference distribution networks. The Wandermeters cost less than many of comparable units and are extremely easy to operate.