Abstract: A spirit level including first and second profile elements which can be displaced relative to one another in a telescopic manner and fixed relative to one another by means of a fixing element. In order to ensure that the first and second profile elements remain aligned with each other irrespective of their position, the first profile element is a hollow profile consisting of two sections which can be joined by means of the second profile element. The first section is joined to the second profile element and the second section can be moved along the remaining area of the second profile element. When the second profile element is at least partially uncovered by the second section, the second profile element can be subjected to the action of force in the direction of a profile wall of the second section of the first profile element.

Abstract: A spirit level including first and second profile elements which can be displaced relative to one another in a telescopic manner and fixed relative to one another by means of a fixing element. In order to ensure that the first and second profile elements remain aligned with each other irrespective of their position, the first profile element is a hollow profile consisting of two sections which can be joined by means of the second profile element. The first section is joined to the second profile element and the second section can be moved along the remaining area of the second profile element. When the second profile element is at least partially uncovered by the second section, the second profile element can be subjected to the action of force in the direction of a profile wall of the second section of the first profile element.

Abstract: A water level includes a hollow metal section having at least one bottom measuring surface and side walls, and at least one position sensor, preferably a bubble level. Usually two bubble levels are provided. The metal section is closed by end caps. A protective cap of an elastic, impact-proof material is placed on the upper side of the metal section and the protective cap is placed on the metal section in such a way that an impact energy introduced at a single point-like location is distributed over a larger surface of the metal section.

Abstract: To increase the slip resistance of level indicators, which comprise an elongate body, spirit level capsules inserted therein and protective end caps, the contact surface adjoining the measuring surface of the level indicator is provided with zones having a high coefficient of friction, for example by clipping on strips consisting of rubber, rubber like plastics material or felt. The strips are shaped to cause the body to incline so that the measuring surface is more toward the support which the contact surface faces.

Abstract: The invention relates to a roll tape measure comprising an extractable measuring tape. Attached to the free end of the measuring tape (1) is a stop hook (4) which comprises a stop member (5) which projects approximately at right angles with respect to the measuring tape (1). That surface (6) of the stop member (5) which faces the measuring tape (1) is coated with friction bodies (7). These consist, for example, of sapphire crystals having a grain size of approximately 0,12 mm. This coating with friction bodies (7) provides the stop hook (4) with a good grip on the edge of the objects to be measured and with a high degree of resistance to wear.