Micronta 21-525B Field Strength / SWR Tester. Used
This is for a MICRONTA Field Strength and Standing Wave Ratio (SWR) Tester. This MICRONTA brand was Sold by Radio Shack, a Division of Tandy Corp. Part Number is 21-525B. It measures 7″ long x 3″ wide x 3″ tall.