Abstract: A spirit level includes a spirit level body having an I-shaped cross section, end caps arranged at the end faces of the spirit level body and at least one spirit level vial mounted in the spirit level body. Each end cap has a plate-like base member which is rectangular in the elevational view thereof and whose height and width corresponds to the height and width of the I-shaped cross section of the spirit level body. The base member has on one side thereof two wing lugs which define a gap therebetween. The width of the gap between the wing lugs corresponds to the wall thickness of the web of the spirit level body which is I-shaped in cross section. At least one recess is provided in the end face of the web of the spirit level body. The at least one recess has at least one toothed side. At least one projecting lug is provided within the gap between the wing lugs of the base member.

Abstract: A water level or spirit level having at least one water level member whose angular adjustment relative to the contact surface can be changed. The water level member is rotatably mounted on the level body or a structural part fixedly connected to the level body. The water level member is fixable in the desired angular position relative to the level body or the structural parts connected to the level body. The rotatable water level member has at least one circumferentially extending flange which engages under a clamping jaw. The clamping jaw can be pressed against the surface of the flange by means of a manually operated clamping member.