Now you can measure 406,121.5, and 243 MHZ in one tester. The Whiffletree BT-100AV triple ELT tester exceeds the measurement requirements for ELTs in the United States. This intuitive product features powerful graphics, power, modulation, and frequency; built-in antenna reception up to 15 meters; and real time audio on 121.5 and 243 MHz.
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