According to the Wiki, t's possible to get the following UVs on a weapon:
Low (worth 1 "point")
Medium (worth 2 "points")
High (worth 3 "points")
Very High (worth 4 "points")
However, it's possible to get the following UVs on helm/shield/armor:
Low (worth 1 "point")
Medium (worth 2 "points")
High (worth 3 "points")
Maximum! (worth ???)
Is "Maximum!" on helm/shield/armor worth the same as "Very High" on a weapon?
"Maximum!" is the same for everything: 6 points.