High quality construction. This antenna analyzer features a black enclosure that protects the unit from damage and supports durable, continuous use. Wide measurement range. SWR measurement range is 1.0 to 9.99. The user can configure the frequency step sizes to 100 Hz, 1 kHz, 10 kHz, and 100 kHz. Key features. Powered by an external 12-14 V DC supply at 500 mA through a 2.1 mm power jack with center positive. Simply connect the power and operate. The device is compact, portable, and pocket friendly. Easy to use. The control buttons are straightforward to operate, allowing quick selection of operating mode, band, and advanced features. Use scenarios. - Tuning ham radio antennas and checking impedance across bands during installation. - On site field testing for antenna matching and quick adjustments. - Verifying SWR and performance for portable antenna setups such as dipoles or verticals in field days or emergencies.