You get parallax errors with analogue meters if you don't align your eye so that it is perpendicular to the pointer. When this happens the pointer can appear to line up with the wrong mark on the...
Always align yourself up with a fiducial mark, horizontally and vertiacally. This will minimise paralax but will not completely avoid it. Human error will always occur
Parallax, more accurately motion parallax, is the change of angular position of two observations of a single object relative to each other as seen by an observer, caused by the motion of the...