| 摘要 |
<p>The invention relates to an indicator (2) for indicating the presence of water in a cavity and includes a suction strip (22) which functions to suck water up to a sugar lump (18) which holds an indicating device (6) in a starting position in a sleeve (4) against the force exerted by a coil spring (16), through the medium of a latch hook (8). When water has been drawn up to the sugar lump by the suction strip and the sugar lump dissolves, the latch hook is released and the spring projects the indicating device (6) from the sleeve to an indicating position.</p> |
