Have a look at Circuit Specialists' catalog of high quality radio frequency (RF) testing equipment. Our selection ranges from low-cost 2-way FM radio testers up to professional-grade 2.9GHz field strength analyzer/frequency counters — the world's first handheld RF field strength analyzer. This compact, lightweight test equipment is designed for effortlessly measuring any digital, on/off keying, or analog signals in a large range of frequencies (depending on the particular RF test device).