No need to call for a radio check when you have this compact, easy-to-use unit onboard. Unlike other meters in its class, the tests receiver function as well as output power and VSWR (antenna efficiency). Powered by an internal battery, the Antenna Radio Tester can also be connected to your ship's 12V DC using the supplied power cable. Battery level can be checked at the flip of a switch. Constructed of die-cast aluminum for long-lasting durability. Model#: ART-3.SPECIFICATIONS:* Frequency Range: 155-158 MHz* RF Power Scale: 0 to 30 watts* Impedance: 50 ohms* Accuracy: +/-10%* Connectors: SO-239* Signal Generator: 3 kHz deviation* Tone: 1000 Hz* RF Level: -115 dBM (approx.) Powered by battery or when connected to ship's 12V Battery level can be checked at a switch flip Die-cast aluminum construction for durability