Features: Impact, dust, and splash resistant More than 8 hours of continuous battery operation Standard built-in InstaCal™ module and Power Meter FlexCal™ maintains calibration with frequency changes Familiar S331D-like Classic Mode and S331E-like Advanced Mode Built-in one button Help function 800x480 7” TFT touch screen display and multiple USB ports Internally store >1000 files with fast preview of stored traces Industry standard *.dat format compatible with Line Sweep Tools (LST) and HHST New! SweepMasters DIRECT online trace delivery service Specifications: 2.0 MHz to 4.0 GHz Cable & Antenna Analyzer 50 MHz to 4.0 GHz Power Meter The S331L replaces the S331D, and is a high-value and rugged handheld cable and antenna analyzer. Utilizing the latest advancements in technology, the S331L has been optimized for field conditions, is easy to use, and has efficient sweep management capabilities. The S331L delivers an entire workday of battery operating time, the most ever offered in a handheld cable and antenna analyzer. With its large outdoor viewable 7" TFT touch screen display, new intuitive GUI, and classic mode that mimic the S331D basic measurement flow, the S331L is very easy to use, and can significantly increase your efficiency in the field. The Site Master S331L is an all inclusive 1-port cable and antenna analyzer covering the 2 MHz to 4 GHz range, with a built-in InstaCal™ module and a built-in power meter.