Edge

Use this function to measure the length of an edge or line.

Cumulated edge

Use this function to measure the length of multiple edges or lines. Select the edges one by one. When you have selected all edges, click on Complete or click the right mouse button to finalize the measurement. You can also create a selection of lines beforehand, then start the measurement and click on From selection.

Point to point (wire)

Use this function to measure the length between two (or more) selected points on edges/wires along these edges/wires. If the points can't be connected by edges/wires, there will be no result.

Also see Snap modes.