| 摘要 |
In a flexible tube level for levelling work, especially in floor-laying, including an at least partially sectionally transparent flexible tube filled with a liquid and an arrangement for fixing one end at a specific height, it is provided for the purpose of achieving a simple construction with high functional reliability in the case of operation by only one person that a sensor device (19) connected to an optical or acoustic indicator device (22) is arranged on the fixed end (3) of the flexible tube (1) in such a way that the sensor device (19) sends a signal to the indicator device (22) when the liquid surface (27) takes up a predetermined level. <IMAGE>
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