Markal Thermomelt 86410 5" Length, 175 degrees Celsius Temperature Indicator Heat Stik Synthetic leather Accurate, fast, low-cost method for measuring surface 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 a glossy, transparent-appearing liquid Accurate to within +/- 1 percent of rated temperature Bigger design makes Thermomelt the industrys longest-lasting heat stick