consists of a go/no go screw thread plug gauge and a reading scale for the depth. the marking for the depth indicates zero in the middle of the first lead.
thread members manufactured of hardened gauge steel, also with cordalox coating available.
for thread diameter from 1 to 250 mm.
scale sleeve can be fixed to check the minimal depth allowance.
solvent resistant scale for colour markings.
space for custom made marks on the back scale.