Eastwood Sheet Metal Gauge
Product Review (submitted on May 17, 2013):
This is the perfect all around gauge to have in the shop. I will take this hands down over a digital gauge anytime. This takes the guess work out of thickness and I set my mig up in twice the time. I also did note that it is made of tempered metal, can't tell you the Rockwell but it is tempered. It is extremely accurate as I tested it against a set of feeler gauges. Great value.