这个指针必须是一个绝对目录路径，因此您可能需要在自己的代码中调整该值。
This pointer must be an absolute directory path, so you may need to tweak this value in your own code.
实验表明：该读数方法绝对误差为零，非常适合于高精度指针式仪表自动跟踪判读。
The experiment shows that the absolute error of the reading approach is zero, which is applicable to automatic tracking reading of high-precision meter very well.
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