accurate position finder

例句：

1. 1. The measurements were accurate to within a few millimeters.
   这些测量准确到几毫米之内。
2. 2. The engineer used an accurate scale to measure the weight of the material.
   工程师使用一个准确的秤来测量材料的重。
3. 3. The scientist conducted an accurate experiment to test his hypothesis.
   科学家进行了一个准确的实验来测试他的假设。