The S331L is newly designed from the ground up. It benefits from the latest technology advancements, and has the best value in a low cost, field optimized, trusted, reliable, rugged, easy to use, one port cable and antenna analyzer. 2 MHz to 4 GHz Handheld Cable and Antenna Analyzer, 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. 800 x 480 7” TFT touch screen display and multiple USB ports. Internally store >1000 files with fast preview of stored traces. SkyBridge Tools™ Trace Manager Empowered.