This Micronta (RadioShack) Field Strength Meter model 21-523 is a reliable tool for any radio communication enthusiast. It is compatible with various brands and is designed to measure the strength of radio signals. The meter is made in China and has not been modified. It is a great addition to your toolkit for radio communication and can help you diagnose any issues with your equipment. This Field Strength Meter is perfect for those who are looking for a reliable and accurate tool to measure their radio signal strength.