visible reading
... visible range 可见区 visible reading 目视读数 visible reserves 视储量 ...
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传统光学水准仪主要靠人工目视读数，存在精度低、测量速度慢、易受人为影响等问题。
Less accuracy, lower speed and easy to be influenced by individuals are characteristic of the traditional optical level, on which the measured data are read by human eyes mainly.
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