Bigger design makes Thermomelt the industry"s longest-lasting heat stick. Bigger, break-resistant stick cuts down on replacement costs. Improved holder features a durable metal shaft and convenient pocket clip. Gravity advance holder protects stick and prevents it from slipping back inside. Meets ANSI/ASME Code B32.1 and B31.3, AWS D1.1 and ASME Code Sec. I, III and VII, NIST traceable. 350 Degrees fahrenheit temperature indicator heat stick.