FieldSweep: Magnetic Field LogFieldSweep: Magnetic Field Log
Magnetic Field Log measures the strength of Earth's magnetic field and localized anomalies with your iPhone. See what's magnetic around you.
Download on the App StoreFeatures
- 01
Real-Time Magnetic Meter
Watch the needle swing as magnetic field strength changes. The gauge displays 0–200 µT (microtesla), with a large digital readout of the current value and a 60-second trend line so you can see how the field varies.
- 02
One-Tap Record & Label
Tap Peak to capture the highest reading. Add a location (Kitchen, Bedroom, Living Room, Desk, Breaker Box, or custom text) and optional notes. Every recording is timestamped and stored on your device.
- 03
Browse & Compare
View all recordings sorted by date (newest first) or field strength (highest first). Tap any entry to see all measurements from the same location side by side, so you can spot patterns.
- 04
Calibration Made Simple
Hold the phone and slowly rotate it in a figure-8 pattern three times. Once calibrated, the meter becomes active. No calibration means no reading—it's that strict about accuracy.
Screenshots
