What is the accuracy of the ground and graduated main vial of a master precision level?

The accuracy of the ground and graduated main vial of a master precision level is 10 seconds. This level of accuracy is critical in precision measurements and ensures that the level can provide highly reliable and precise readings during surveying or construction tasks.

A master precision level is specifically designed for tasks that require elevated accuracy, such as creating precise horizontal planes or aligning structures. The 10 seconds accuracy means that the instrument can detect deviations as small as 10 seconds of arc (1/3600 of a degree) in its measurement, which reflects the high level of care taken in its construction and calibration.

In practical terms, this level of accuracy is vital for professionals who need extremely precise measurements in their work, distinguishing a master level from lower precision versions that might have a greater degree of error. Therefore, the answer aligns well with industry standards for precision tools used in tasks that demand exact angles and alignments.