Levelling and transit system

摘要: A device for performing levelling and transit functions is disclosed herein having an elongated member with parallel spaced-apart top bottom flat surfaces separated by a thickened web. The web includes several cutouts exposing bubble indicators arranged in variety of orientations rotary module at one end movably mounting laser beam generator. has passageway conducting to selected slots or passageways provided the response manual rotation user whereby exits linear path. housing adjacent enclosing electrical circuits, battery power supply button controls operation laser. pivoting panel coextensive surface stored position while pivotal normal when used as corner square. thumb adjustment screw protrudes from through angle if desired.