ProLevel | Advanced Spirit Level

A professional spirit level for mobile devices.

ProLevel measures and displays the angle of your device against gravity, with the maximum accuracy that the internal sensors permit.

FEATURES:

- Audio Feedback: dual-axis advanced audio feedback with separate tones, for using the app without looking at the display
- Selectable Ranges and Scales (linear or logarithmic)
- Selectable Tolerance: choose the maximum inclination that is considered flat, both for visual and audible indication
- Advanced Calibrator: very accurate, calibration is possible even on non-level surfaces
- Adjustable Averager: eliminate spurious readouts from vibration, or measure the average inclination over time
- Peak Hold: visualize the entire range of inclinations that were measured over time
- In-App help
- Minimalist, precise, to-the-point design: you wont find animated photorealistic bubbles anywhere in this app!

Note that ProLevel is meant for leveling surfaces (lying on a surface), not for measuring, for instance, the inclination of a wall (this feature may be added later).

Accuracy / Legal notice

In our experience, measurement error is roughly +/- 0.1 degrees, mainly due to drift. Please note that for legal reasons, we need to explicitly state that this app is not "meant for professional use", even though we are convinced it is one of the most "professional" (in terms of features / readout accuracy) apps of this kind in the App Store.