Magnetometer+ turns your phone into a field meter, compass and metal finder: sweep a wall to locate the screws in a stud.
Magnetometer+ turns your iPhone's magnetic sensor into a metal detector and stud finder for iron and steel hidden in walls, floors and furniture, and shows the magnetic field around you in µT.
▶ WHAT IT FINDS — AND WHAT IT DOES NOT
It detects ferrous metal: screws and nails in studs and joists, steel pipes, rebar, hinges, brackets and door strikes. The range is a few centimetres, so hold the phone against the surface and sweep slowly.
It cannot detect gold, silver, copper, aluminium, wood or plastic. Those materials are not magnetic, and no phone sensor can find them. If you are looking for buried coins or copper wiring, this is not the tool.
▶ CALIBRATES FROM YOUR HAND
Every phone's magnetic sensor carries a large built-in offset from its own speaker and battery magnets. Magnetometer+ learns that offset while you turn the phone, so tilting the phone does not look like metal. When the meter opens, a progress bar shows how far calibration has come: turn the phone slowly in every direction, and when the bar is full the reading goes live with a short vibration. Zero here re-learns it wherever you are.
▶ THREE METER MODES
• Auto — a radial gauge of the field deviation
• Earth Field — total field strength with a latitude band (low, normal, elevated, high)
• Metal Detector — deviation from the background field with an intensity verdict, plus optional vibration pulses that quicken as you get closer
▶ SCANNER AND STUD FINDER
The Scanner tab has a metal scanner for sweeping a surface and a Stud Finder that marks the strongest point as you slide the phone flat across a wall. It finds the nails and screws that hold drywall to the studs; it does not see the wood itself.
▶ COMPASS
A compass with magnetic north or true north and the local declination.
▶ LIVE DATA
• X, Y and Z field components on a live chart
• Min, average, max and peak with elapsed time
• Sensitivity from 0.5x to 2.0x
• µT, mT and Gauss units
▶ HISTORY AND EXPORT
• Readings are saved with a 7-day trend and a plain-language comparison
• Favourites and side-by-side comparison of two readings
• Continuous one-second logging with CSV export
• Share a reading as an image, optional GPS tag on saved readings
• Statistics report, unlocked for 24 hours by watching a short ad
USEFUL FOR DIY AND RENOVATION · FINDING STUDS AND JOISTS · CHECKING FOR REBAR OR PIPES BEFORE DRILLING · PHYSICS CLASS AND MAGNET EXPERIMENTS
At the moment I tap play it started showing the field generated by a strong magnet in my nightstand 1 meter away
Developer Response
Thank you! Glad it picked up the magnetic field right away. ⚡
• Stud Finder now offers a Ready-check: hold the phone in the air, then pass it over a screw you can see, and Magnetometer+ learns how strongly this phone reacts before you scan a wall. It takes under 30 seconds.
• The app has been rebuilt on a newer, shared foundation with a refreshed opening screen, menu and exit dialog.
• Your saved measurements, calibration and settings carry over unchanged.
Version 1.0.34
The developer, Kyu-Hee Jang, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
Identifiers
Usage Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
Identifiers
Usage Data
Diagnostics
Privacy practices may vary, for example, based on the features you use or your age. Learn More
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
Seller
Kyu-Hee Jang
Size
92.5 MB
Category
Productivity
Compatibility
Requires iOS 16.4 or later.
iPhone Requires iOS 16.4 or later.
Mac Requires macOS 12.0 or later and a Mac with Apple M1 chip or later.
