| 摘要 |
A device for measuring height despite difficult visibility comprises a small portable water tank positioned at the location to be measured and a pressure transducer placed at a reference location and connected with the water tank by a hose, whereby the transducer outputs a signal voltage proportional to hydrostatic pressure and hence to the height of the first location. The output signal is amplified and converted to a digital value which is displayed by a digital display calibrated in terms of height.
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