This tester is designed for measuring the bottom thickness of cookware and is applicable for frying pan, baking pan and other kinds of pan. The tester consists of four glass rods arranged in a triangle, the three rods outside support the middle measurement rod to stably test on the cookware inner surface, customers separately carry out one test before and after the cookware is used, then adopting the digital dial indicator to record the value of thickness, observing whether the thickness value changes or not.