MeterWorks Teslameter: an honest magnetic field meter.
view on the app store ↗ ios · iphone & ipad
The honest teslameter: measure magnetic fields in µT (microtesla), locate magnets and metal, check the AC component — with recording and export. One-time purchase — no ads, no subscription.
Find what's magnetic
A large field-strength reading (|B|) updates in real time on a live graph, across all three axes plus the combined magnitude, sampled at 100 Hz in µT or mG (milligauss). A baseline calibration nulls the ambient field, so switching to delta mode turns the phone into a simple magnetic-field detector, making it easy to track down a magnet or a piece of magnetic metal. Compass calibration status is shown alongside the reading.
Recordings and analysis
Every recording comes with RMS, peak, peak-to-peak and crest-factor values, with zoom, pan and a cursor on the graph. Pro adds an FFT spectrum with a peak list and an AC-field indicator (beta) that flags 50 Hz mains hum specifically.
Honest about its limits
The magnetometer measures static and low-frequency fields up to around 50 Hz — high-frequency sources such as mobile networks, Wi-Fi or Bluetooth are explicitly not measurable, and this is not a substitute for a proper stud or cable finder. What it's genuinely good for: locating magnets and magnetic metal, comparing the field strength of speakers or magnets, an indicative check of low-frequency fields, and showing Earth's own field for a physics lesson.
- PNG overview export, free
- CSV export of raw data and a multi-page PDF report (Pro)
- Free tier: unlimited live measurement, three recordings up to 10 seconds each
MeterWorks Teslameter is not a calibrated measuring instrument and must not be used for safety-critical, occupational-safety, or court-evidentiary purposes. It gives an indicative reading, not a certified one. Digitalbucht is the sole proprietorship of Emil Deak, based in Wülfrath, Germany. No team, no agency, no middle layer.
Data and privacy
The app uses the device's motion and magnetic-field sensors. Recorded values are processed and stored only on your device — no audio recordings are made. On start, it anonymously checks with Apple whether the sibling MeterWorks apps are available in your storefront; no personal data is sent. Exporting or sharing a recording only happens on your own action. No adverts, no tracking.
Full terms of use and privacy policy for all apps: Apps: terms & privacy.
More: all apps · MeterWorks Sound Meter and MeterWorks Vibrometer.
Last updated: August 2026
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