物理实验常用仪器的读数规则可归纳、简化为两种：估读和直读，借助这些规则可规范和简化不确定度的评定。
There are two methods to read data from common instrument in physics experiment: the approximate read and direct read. We disscussed the rules to read data and to evaluate the error range.
结论：本实验的不确定度主要由标准曲线及仪器读数所引入。
Conclusion: It is found out that the uncertainty of this experiment is main caused by calibration curve and measurement results of apparatus.
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