Up for sale is a clean, fully-tested Micronta (Radio Shack) Cat. No. 21-525B Field Strength and Standing Wave Ratio (SWR) Tester. Ideal for CB, ham, and short-wave enthusiasts, this compact bench meter lets you quickly check antenna system efficiency and transmitted signal strength without permanently disconnecting your coax.

WHAT’S INCLUDED

• Micronta 21-525B tester unit

• Original factory carton with molded insert (box shows edge/shelf wear)

• Owner’s manual & quick-reference sheet

KEY FEATURES

• Frequency coverage: 3-30 MHz (HF & CB bands)

• Handles up to 1,000 W PEP

• Forward/Reflected switch with large, easy-to-read analog meter

• Built-in CAL (calibration) control knob for fast SWR alignment

• SO-239 (UHF) input & output connectors – inline installation

• Small tabletop size: 7 × 2.5 × 2 in (approx.)

• Rubber feet and metal case for stable bench use

CONDITION

• Used – Tested & Functional. Meter face is clear, needle rests at zero, and readings were verified on a 50-ohm dummy load and a live RF signal up to 100 W with accurate forward/reflected power indication.

• Knobs/switches turn smoothly. Light scuffs on case; original box is worn with tape residue and edge tears.

SHIPPING & HANDLING

Will be packed with plenty of cushioning inside a sturdy outer box. Ships within 1 business day of cleared payment.

Add this classic, fully functional Micronta meter to your shack today and keep your antenna system performing at its best!

-Item Specifics-

🔍 MPN: 21-525B

🔍 Type: Field Strength & SWR Meter

🔍 Brand: Micronta

🔍 Model: 21-525B

🔍 Maximum Power: 1000 W PEP

🔍 Connector Type: SO-239 (UHF Female)

🔍 Included Items: Meter, Original Box, Manuals

🔍 Frequency Range: 3-30 MHz

🔍 Number of Inputs: 1

🔍 Number of Outputs: 1

🔍 Compatible Product: CB Radio, Ham Radio, Shortwave Transceiver

🔍 Measurement Provided: SWR & Field Strength

🔍 Country/Region of Manufacture: China

🔍 UPC: N/A

🔍 Band: HF

🎨 Color: Black / Silver

⭐ Features: Analog Display, Calibration Knob, Forward/Reflected Switch

📐 Dimensions: Approx. 7 in W × 2.5 in H × 2 in D

🔍 Custom Bundle: No

📅 Year Manufactured: c. 1980s-1990s

-Condition Details-

Used – Tested & Functional: verified accurate SWR and power readings; box shows wear

-Additional Details-

Please review the photos carefully and feel free to ask any questions, concerns, or offers!

The item in the photos is the exact item shown. If any details in the description seem different from the pictures, please trust the photos as the most accurate representation of the item.

If you notice an error in the listing, please feel free to let me know!

All items are stored in a clean, weather- and temperature-controlled environment, free of pets and smoke. I take great care in packaging every shipment to ensure your item arrives quickly and in excellent condition.

Thank you for your support! Be sure to check out my other items. Happy shopping!

-Keywords-

Micronta SWR meter, Radio Shack 21-525B, field strength tester, ham radio accessory, CB antenna meter, 3-30 MHz meter, tested working