This little gauge is for all the clubs and ring stewards out there. In Australia the regulations state that if a slab is greater than 12mm then the competitor is disqualified. So we designed this little gauge to fit comfortably in your pocket.
It's a cool looking ellipse shape so it won't dig into you through your pocket and it has a 12mm diameter hole in it. If the slab fits in the hole then it's less than 12mm and you're all good. If the slab doesn't fit in the hole, then it's larger than 12mm and the competitor is disqualified. It's as simple as that.
3mm stainless steel, laser cut and etched. It's only 70mm x 40mm