Originally Posted by
Sam Buchanan
What I find handy about a digital level and/or the phone app is how easy it is to set flying surface incidence. Regardless of whether or not fuse longerons are perfectly level, the app can be aligned with them then set to 'zero'. The required incidence value (for example, 2.5*) can then be directly read on the digital readout. In other words, the device is reading the difference in degrees between two components. It is much more complicated to complete this operation with levels that don't have digital indicators. The accuracy of these operations still depend on the care taken by the builder and a good straight edge is also useful.