* Precision refers to how finely a measurement can be made. The more decimal places a measurement has, the more precise the instrument used.
* 8.1956 m has four decimal places, indicating a high level of precision.
* 8.20 m has two decimal places, suggesting less precision.
* 8.196 m has three decimal places, falling in between the other two.
Therefore, the device that measured 8.1956 m was capable of making the finest distinctions.
