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The S331L Site Master™ Handheld Cable and Antenna Analyzer is a compact field instrument developed for fast and reliable cable, antenna, and RF line testing. Designed for contractors, installation teams, and wireless network technicians, it simplifies routine maintenance by providing accurate transmission line measurements in an easy-to-use portable platform.
With its rugged construction, extended battery life, and integrated calibration technology, the S331L helps field engineers complete installation, commissioning, and maintenance tasks efficiently while reducing overall site testing time.
EnquirySuccessful wireless network deployment begins with properly installed transmission lines and antenna systems.
The S331L is specifically designed to simplify these verification tasks by delivering essential cable and antenna measurements without the complexity of advanced laboratory instruments.
Its intuitive touchscreen interface, lightweight construction, and optimized workflow allow technicians to perform routine inspections, detect faults, and document results quickly, making it an ideal companion for daily field operations.
Frequent calibration can slow field operations, particularly when testing multiple frequency ranges. The S331L incorporates InstaCal™ and FlexCal™ technologies that simplify calibration procedures while maintaining measurement accuracy throughout the testing process.
This intelligent calibration approach minimizes setup time and allows engineers to move efficiently between different measurement tasks.
Calibration Features
The S331L is engineered to withstand demanding outdoor environments while maintaining reliable performance throughout a full working day. Its lightweight design and daylight-readable display provide comfortable operation for technicians working on towers, rooftops, and remote communication sites.
Field Performance
Efficient field testing extends beyond measurements—it also requires fast documentation and organized reporting. The S331L provides integrated storage and reporting tools that simplify record management while helping engineers generate professional maintenance reports directly from the instrument.
Productivity Features

Frequency Range
Measurement Functions
Performance Features
Connectivity
The S331L Site Master™ is ideal for cable and antenna verification across a wide range of field applications, including:

We can help you with a solution tailor to your specific need.