量表单独使用时的满刻度读数可以为15伏。
用读数保持电路记录压力变化，较直接读取刻度值更加准确，可靠。
More precise and reliable recording is achieved by reading-keeping circuit compared with the original gauge-reading.
罗马人发明的一种漏壶则是让水从蓄水器滴入一圆筒，筒内有一浮子，在筒壁的刻度尺上指示读数。
The Romans invented a clepsydra consisting of a cylinder into which water dripped from a reservoir; a float provided readings against a scale on the cylinder wall.
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