"Nissei DG-503 MAX SWR and Power Meter with 3.5 inch LCD display"
"Nissei DG-503 MAX SWR and Power Meter with 3.5 inch LCD display"
"Compact Nissei DG-503 MAX SWR Power Meter showing durable build and connectors"
"Large LCD screen of Nissei DG-503 MAX displaying Forward Power, Reflected Power, and VSWR ratio"
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"Nissei DG-503 MAX SWR and Power Meter with 3.5 inch LCD display"
"Compact Nissei DG-503 MAX SWR Power Meter showing durable build and connectors"
"Large LCD screen of Nissei DG-503 MAX displaying Forward Power, Reflected Power, and VSWR ratio"

Nissei Radio Products – Amateur & Professional Communication Gear

Nissei DG-503 MAX SWR & Power Meter (DMR/SSB/AM Compatible)

£139.00
(£115.83 exc. VAT)
£159.95
(£133.29 exc. VAT)
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Worldwide delivery
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Digital Mode Support - Yes (DMR/TDMA)
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Product code: DG-503MAX
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Item CostFinance OptionDepositMonthly PaymentsTotal Cost
£159.95
12 Months 14.9% APR
£15.99
£13.78
£181.40
£159.95
18 Months 14.9% APR
£15.99
£9.19
£181.40
£159.95
24 Months 14.9% APR
£15.99
£6.89
£181.40
£159.95
36 Months 14.9% APR
£15.99
£4.59
£181.40
£159.95
48 Months 14.9% APR
£15.99
£3.45
£181.40
£159.95
12 Months 19.5% APR
£15.99
£14.34
£188.02
£159.95
18 Months 19.5% APR
£15.99
£9.56
£188.02
£159.95
24 Months 19.5% APR
£15.99
£7.17
£188.02
£159.95
36 Months 19.5% APR
£15.99
£4.78
£188.02
£159.95
48 Months 19.5% APR
£15.99
£3.58
£188.02

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Nissei DG-503 MAX SWR & Power Meter (DMR/SSB/AM Compatible)


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Nissei DG-503 MAX SWR & Power Meter

The Nissei DG-503 MAX is a professional-grade SWR & Power meter designed for both analogue and digital transceivers. Built for accuracy and ease of use, it’s the ideal tool for radio enthusiasts and operators who demand reliable performance.

Key Features

  • Large 3.5" LCD Display – Clear, easy-to-read measurements at a glance

  • One-Push Measurement – Instantly check Forward Power, Reflected Power, and VSWR ratio

  • Multi-Mode Compatibility – Supports DMR (TDMA), AM, and SSB signals

  • Compact & Durable – Lightweight design with robust build quality

Technical Specifications

SpecificationDG-503 / DG-503 MAX
Frequency Range1.6–60 MHz / 125–525 MHz
Power Range0–200W (±5% accuracy)
Calibration Points28 / 145 / 435 MHz
ConnectorsSO239 (N-female option available)
Dimensions140 × 84 × 122 mm
Weight750 g
Minimum Power for SWR1 W
Insertion Loss< 0.1 dB
Impedance50 Ω


Included Accessories

  • Operation Manual

  • 12V DC Wire.

SWR & Power Meter Comparison

Based on the alternatives shown on the DG‑503 MAX product page

FeatureNissei DG‑503 MAXDiamond SX‑600NComet CMX‑400Daiwa CN‑901VN
Display3.5" LCDAnalogueAnalogueAnalogue
Power Range0–200 WUp to 200 WUp to 200 WUp to 200 W
Frequency Range1.6–60 MHz / 125–525 MHzHF/VHF/UHFVHF/UHFHF/VHF/UHF
Digital Mode SupportYes (DMR/TDMA)Not specifiedNot specifiedNot specified
Accuracy±5%Typical analogue accuracyTypical analogue accuracyTypical analogue accuracy
ConnectorsSO‑239 (N‑type optional)SO‑239SO‑239SO‑239
Special FeaturesOne‑push measurement, LCDClassic dual‑needleCompactLarge meter face
Price£139VariesVariesHigher-end


Summary of Differences

Nissei DG‑503 MAX

  • Only one with a large LCD display

  • Supports DMR/TDMA, making it ideal for modern digital repeaters

  • Very compact

  • 200 W capability across HF + VHF/UHF

  • Most feature‑rich of the group

Diamond SX‑600N

  • Trusted analogue meter

  • Wide frequency coverage

  • Good for operators who prefer needle movementover digital displays

Comet CMX‑400

  • VHF/UHF‑focused

  • Compact and simple

  • Good for mobile or shack VHF/UHF setups

Daiwa CN‑901VN

  • Large analogue meter

  • Very easy to read

  • Popular with HF operators who want a big, clear display.


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