Abstract: A peg for the use in a construction industry is disclosed. The peg may include: a main longitudinal body configured to be inserted into a solid surface, and an indicator. The indicator may be configured to adaptively present visual quantitative information related to at least one of: a tip of the peg and construction task instructions. The indicator may include a scale notches for marking height such that the scale notches may be marked on at least a portion of the main longitudinal body. The peg may further include a marker for adaptively marking the solid surface related information.

Abstract: Disclosed herein is a hovering device for land marking. The hovering device may include: a hovering unit, a position detector attached to the hovering unit; at least one marker application unit carried by the hovering unit; at least one markers container, carried by the hovering unit, for feeding one or more markers to the at least one marker application unit; and a controller configured to: receive a location in an area to be marked by a marker; direct the hovering unit to hover over the location based on information received from the position detector; and control the at least one marker application unit to apply a marker to the location.