Commission Regulation (EC) No 517/2008 of 10 June 2008 laying down detailed rules for the implementation of Council Regulation (EC) No 850/98 as regards the determination of the mesh size and assessing the thickness of twine of fishing nets
When measuring the meshes the inspector shall:
insert the jaws into the mesh opening with the fixed jaw of the gauge against the knot, as shown in the figure below;
activate the gauge allowing the jaws to open until the movable jaw reaches the opposite knot and stops when the set force is reached: