Review on Dual Sided Stainless Thickness Inspection Gauge - OSOF by Fernando Beck

I've run many DC cables on vintage motorcycles and other sport vehicles and wired my RV complete with battery pack, inverter, solar panels and controller, marine switches and tires and welding cables 2/0 but I've never had a wire gauge. I am also welding more and more and always focus on metal gauges. Is 18 gauge thicker or thinner than 16 gauge? What is the maximum wire size that will fit this DINSE connector? Now I finally know. It's worth a few bucks to hang over a bench in a store.