Difference Between Line Standard and End Standard in Metrology

Line Standard

End Standard

Distance between two engraved lines is used for measurement.

Distance between two flat parallel surfaces is used for measurement.

Scale graduations marking are not subjected to wear.

End surfaces subjected to wear.

Quick and easy measurement.

Only one measurement at time. So, it is time consuming.

Limited accuracy of 0.2mm. It can’t use for close tolerance measurement.

High accuracy. Dimensional tolerance as close as 0.0005mm.

It does not has built in datum, so alignment with measurement axis difficult.

It has built in datum, so it is easy to align with measurement axis.

Parallax error can be occurred in measurement.

Not subjected to parallax error.

Its manufacture is simple and cost low.

Complex manufacturing process required. Cost is high.

Example: Meter scale, Yard, etc.

Example: Slip gauges, End bars, Gap gauges etc.