US
Gbnryg

Professional Metal Detector for Adults.

  • 12 inch search coil, IP68 waterproof
  • 5 modes, DSP chip
  • Backlit LCD display
  • 53 inches extended length
  • 5.8 pounds, battery powered

Last refreshed Sep 11, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.

Our verdict

A large-coil metal detector for shoreline and prospecting use with a waterproof coil, five modes and a backlit screen. The package quantity entry looks wrong and no battery details are given.

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ASIN: B0D3C25SX8Model: M55Z-SX8Category: Metal Detectors

Colors Available

M55Z&GreenM55J&Grey

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Overview

Gbnryg builds this detector around a large waterproof search coil, a backlit LCD and a DSP chip for processing signals. A shaft extends to a stated full length, and the listing positions it for beach and gold hunting.

Reason to buy: the big coil covers ground quickly and the waterproof rating applies to the coil in the title. Limitation: the listing never says what powers it beyond battery, how deep it detects or whether the electronics housing is watertight.

Who it's for

Beach and field hunters who want wide ground coverage and a selection of modes will like the large coil and the screen. Newcomers needing a simple, light unit or detailed specifications should look at better-documented options.

Pros and cons

Pros
  • Large waterproof search coil
  • Five search modes
  • Backlit LCD display
  • DSP chip for processing
Cons
  • Control box waterproofing not stated
  • Battery type and life unlisted
  • Package quantity entry looks wrong
  • Heavier than compact models

Performance notes

A larger coil covers more ground per sweep and reaches deeper on large targets, but it is less sharp on small ones. The modes change how the detector treats different metals, and the DSP chip handles signal processing. An IP68 coil can go into water, though the control box is a separate question.

Specifications

BrandGbnryg
ModelM55Z-SX8
Dimensions & fit
Search coil size12 inches, IP68 waterproof
Length53 inches
Weight5.8 pounds
Dimensions (L x W x H)17 x 11 x 5.9 inches
Power & efficiency
Power sourceBattery powered
Construction & materials
Case materialMetal, plastic
ColorM55Z and green
Other details
Modes5
Display typeLCD with backlight

Frequently asked questions

How do I care for the Gbnryg detector after beach use?

The listing gives no care instructions. Only the search coil is called IP68 waterproof, so rinse the coil and keep the control box dry, and wipe it down before storing.

Does the Gbnryg detector come as a 24 count pack?

The unit count entry says 24 Count, which looks like a listing error for a single detector. Confirm the quantity with the seller.