摘要：

A bubble element for a spirit or water level includes a bubble element body composed of a transparent material and having a hollow interior containing a bubble element fluid and marking rings for indicating a center position of a bubble enclosed in the bubble element fluid. At least over a middle portion of the bubble element body in the longitudinal direction which contains the marking rings, an upper side of the bubble element body has a surface which curves around the longitudinal axis of the bubble element body, wherein the curved surface is connected with a continuous curvature and without edges to side surfaces of the bubble element body. At least over the middle portion of the bubble element body, the surface forming the upper side of the bubble element body extends additionally convexly curved in the longitudinal direction of the bubble element body and, seen in the longitudinal center section of the bubble element body, the wall thickness of the bubble element body increases in the middle portion toward the middle of the longitudinal extension of the bubble element body.

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