Micronta Field Strength/SWR Tester, Cat. No. 21-525B Tandy (Radio Shack) Corp

Radio Shack MICRONTA Field Strength & SWR Tester Model 21-525A

Radio Shack Micronta Field Strength/SWR Tester 21-525B

Micronta Radio Shack 21-523 Field Strength SWR Tester with box and manual

Vintage Radio Shack Micronta Field Strength and SWR Tester 21-525B

Vintage Micronta Field Strength SWR Tester Electronics By Radio Shack 21-525A

Micronta 3-Way CB Tester Radio Shack Cat No 21-526

MICRONTA Field Strength and SWR Tester Model 21-525B