Understanding the reference angle
iLevel can easily be used to measure differences between angles on surfaces. The difference is measured between the current (continuously measured) angle and a stored angle. With no stored angle selected, differences are measured against 0° | 0°.
Measuring differences
The picture below shows how to measure the difference to a stored angle.
- Marker 1 highlights the selected stored angle.
- Marker 2 highlights the angular differences.
![Measure-2D-Angles-Difference-Stored](https://i0.wp.com/www.jrsoftworx.com/wp-content/uploads/media/supportScreens/Measure-2D-Angles-Difference-Stored.jpg?fit=2533%2C1171&ssl=1)