The industries longest lasting stick. Accurate, fast, low-cost method for measuring surfaces temperatures. Ideal for applications such as annealing, forging, welding, bending, forming and any place where temperature measuring is necessary. When using, the initial mark appears dull and chalky; when desired temperature is reached, the mark quickly melts to glossy, transparent-appearing liquid. Accurate to within +/- 1% of Fahrenheit and +/- 3% of Celsius rated temperature. 33% bigger and stronger; same proven reliability. The bigger design makes Thermomelt the industries longest lasting heat stick. Made in the USA.