The observed height of the mercury barometer column is h=752 6 mm. The least count on the vernier scale is 0 1 mm, so one might estimate the probable measurement error as 0 05 mm.

A measurement probably could not be made this precisely. The barometer sliders and meniscus must be aligned by eye. The slider has a least count of 1 mm.

As a conservative estimate, a measurement could be made to the nearest millimeter.

The probable value of a single measurement then would be expressed as 752 6 0 5 mm. The relative uncertainty in barometric height would be stated as

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0.5 mm Un = 0.000664 or 0.0664 percent 752.6 mm