Zircon MetalliScanner m40 Handheld Metal Detector - Reliable Wall

In this review the Zircon MetalliScanner m40 is presented as a practical, no-nonsense handheld metal detector for homeowners and tradespeople who need to find metal behind non-metallic surfaces. The bottom line: it is best for locating nails, screws, plumbing and rebar in drywall, plaster, lathe and concrete because it reliably detects ferrous metal up to 4 in and non-ferrous metal up to 2 in, making it a useful alternative to traditional stud finders when metal rather than wood is the target.

Key Features

• Depth detection: Locates ferrous (magnetic) metal up to 4 in deep so you can find rebar and heavy fasteners in concrete and plaster.
• Non-ferrous sensing: Detects non-ferrous metal up to 2 in deep, which helps when tracking copper plumbing or aluminum ductwork behind walls.
• Multiple scan modes: Two scanning positions, Wide Scan and Pinpoint Scan, let the user quickly survey a large area then zero in on a detected target.
• Surface versatility: Works on drywall, lath and plaster, wood, tile, stucco and concrete, making it useful across renovation and repair jobs.
• Simple calibration: The power/calibrate procedure is straightforward: install the included 9V battery, hold the blue sensor parallel to the surface, and wait for the ready beep and LED.

Who It's For

The MetalliScanner m40 is aimed at homeowners, remodelers and contractors who need to locate metal in older plaster walls, behind tiles or in concrete floors where traditional stud finders may fail. Its ability to find rebar and screws makes it handy for those preparing to drill, cut or anchor into walls.

It is less suitable for users who need advanced multi-function electronic detection (live wire detection or extremely deep utility locating) or who require Bluetooth/recording features; those professionals should look at dedicated utility locators for buried or live-line work.

Pros & Cons

Pros

• Dependable metal detection in plaster and drywall where wood-only stud finders struggle.
• Good depth capability for ferrous and non-ferrous targets, covering common plumbing and rebar depths.
• Easy to use calibration and clear Ready LED feedback make initial setup quick.

Cons

• Beep frequency and audio feedback reported by some users can be less distinct during fine pinpointing.
• No built-in display of depth in inches or digital readout, so users must rely on feel and repeated passes for exact placement.

Specifications

Brand	Zircon
Model	MetalliScanner m40
Ferrous detection depth	Up to 4 in (102 mm)
Non-ferrous detection depth	Up to 2 in (51 mm)
Scanning modes	Wide Scan and Pinpoint Scan
Power	Included 9V alkaline battery
Surfaces	Drywall, lath and plaster, wood, tile, stucco, concrete

Our Verdict

The Zircon MetalliScanner m40 is a solid, value-focused tool for anyone who needs to find metal in walls and slabs without complex setup. Its clear strength is detecting ferrous metal to reasonable depth in plaster and concrete, and it is worth buying for remodelers and DIYers who prioritize accurate metal detection over extra features.

Frequently Asked Questions

How deep will this detector find metal?
The m40 locates ferrous metal up to about 4 in and non-ferrous metal up to about 2 in, suitable for typical rebar and plumbing detection.

Can it find studs in plaster walls?
Yes - customers report it works well as a stud finder in lathe and plaster construction by detecting nails and screws associated with studs.

What surfaces will it scan?
It is designed to scan drywall, lath and plaster, wood, tile, stucco and concrete and other non-metallic surfaces.