maurieo's Two Peg Test for Levels

http://www.maurieo.com [email protected] A look at the standard two peg tests for optical and digital levels, how it works and why with an explanation of the rational behind it. Everyone using a level should be able to do this very simple test to check that the level is within calibration or in need of servicing. Whether you are using a dumpy level or first order digital level you need to be able to know and understand the two peg test.