Your requirements may vary, so we'll give you a total measurement in feet to compare. (geekwrapped.com)
This allows high - precision measurements in a short time and considerably facilitates the future reduction of the total measurement uncertainty down to a few parts in 1018. (sciencedaily.com)
«The total measurement uncertainty lies at only 4 × 10 - 19, allowing a height difference of 4 mm between clocks to be resolved within 100 seconds of measurement time only.» (sciencedaily.com)