Magnetometer+

About this app

Magnetometer+ turns your iPhone into a precise magnetic field meter with three purpose-built modes — and now keeps a full history of every reading. THREE MODES • Auto — radial gauge with raw total field magnitude. • Earth Field — total field with latitude band (low / normal / elevated / high). • Metal Detector — baseline-calibrated detection with intensity verdict (no metal / weak / detected / strong / large) and live haptic feedback. WHAT'S NEW • ⌖ Zero Calibration — capture your environment's device-internal field bias as the 0 reference, so subsequent readings show only deviation. Just like a real metal detector. • Haptic Feedback — Metal mode pulses faster and stronger as you approach ferrous objects. Toggle on/off from main screen. • Unit Toggle — switch between µT, mT and Gauss with a single tap. • GPS Tagging — optionally tag saved measurements with location coordinates. • Measurement History — every reading is auto-saved with a 7-day trend chart and insights like "+12% vs your 7-day average". • Notes & Favorites — add a note ("wall stud", "buried pipe") and star to any saved reading. • Compare Mode — pick two saved readings and view the difference side by side. • Share Result — share your current reading as an image. • CSV Export — share all your measurements as CSV for spreadsheets. CORE FEATURES • Real-time 3-axis magnetic field measurement • Kalman-smoothed sensor readings • Min/Max/Avg/Peak tracking with elapsed time • Sensitivity adjustment 0.5x – 2.0x • Total field magnitude + per-axis components • Reference library: Earth field bands, metal intensity classes HONEST TECH NOTE iPhone magnetometers are uncalibrated and include device-internal bias (~300–450 µT from speaker / motor / battery magnets). The ⌖ Zero button captures that bias so subsequent readings reflect only field changes in your environment — same workflow as a physical metal detector. FOR HOBBYISTS · DIY · STUD FINDING · TREASURE HUNTING · CABLE DETECTION · EDUCATION Available in 14 languages.

Your readings are now saved when you leave the meter, not only when you stop recording by hand. Recording starts on its own, so anyone who simply watched the live field and switched tabs was losing that measurement — it is kept now. Unlocking a report also no longer leaves you waiting on a spinner when no video is available.

Momentum comes from crawler snapshots for the tracked storefront. “Viral growth signal” means unusually fast recent rating gains; it is an indicator, not download data.

1. First observed Aug 18, 2026 · 2:57 AM Free