RT Agencies Sells Auto Levels. Auto Levels are used by Builders and contractors to measure, transfer, and set out Horizontal lines on a construction site. Auto Levels have been around since the 1830’s.A dumpy level is mounted on a tripod then by manipulating the foot screws until the Dumpy Level is level on its horizontal plain . . RT Agencies offers 2 models the AL series and the G2 Engineers Auto Level.