BUILT-IN Frequency Counter! "S" designates for single side-band users AM / USB / LSB Frequencies Includes 3 foot plug in speaker lead for tone generation in to mic For any radio without hard-wiring Momentary toggle allows for single side-band reading without voice Allows Ham/Amateur users to accurately measure frequency in 1.8 MHz to 50 MHz range Three 2 1/2 inch lighted Meters Simultaneous readouts on all 3 meters Measures SWR Measures AM Modulation Reads Peak Watts Three Watt Ranges: 0 - 10, 0 - 100, and 0 - 1000 Power Pack Included DOSY Text Book Architecture