| 摘要 |
A cesspit water level indicator is provided. The water level indicator includes an expansible element which carries a sliding rod to move up and down relative to a fixed rod responsive to the change of water level in a cesspit. The sliding rod includes an electrical contact in the form of a pin. The pin slidably engages a resistive plate mounted to the fixed rod. The change in electrical resistance is indicative of the change of water level in the cesspit.
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