This free Android app turned my phone into a 35-tool measuring tool - and I tested everything

Phyphox is a free, open-source Android app from Aachen University that unlocks phone sensors (accelerometer, gyroscope, microphone, magnetometer, light sensor, GPS, and barometer) for scientific experiments. The article highlights the app's 35 tests (including audio spectrum, magnetometer, and various stopwatches), gives usage examples (measuring incline, audio peak frequency, luminance, and magnetic field strength), and recommends it as a valuable tool for experimentation and data export.