Same tape measure. a little further along to mark the next wall, A bit more work than nessasary. But it is not for me . it is for the reader.

The end result is the tape measure with stuck on masking tape marks. This indicates where the walls are.

This is strickly to be able to ensure that non of the lines in the plank patterns clash with the line of the wall wall. Not so important with the lines on this sheet vinyl, But a small back and white tile pattern any crookedness will stand out like Dogs Balls.