These cost-effective, easy-to-use temperature-indicating crayon sticks provide fast, accurate surface temperature measurements for a wide range of applications. The sticks are available in temperature ratings from 100 to 650⁰F (38 to 343⁰C) with a NIST-traceable accuracy of ±1%. Simply apply to heated surface—crayon melts instantly at designated temperature leaving a distinct mark for easy and immediate visual inspection. Featuring a unique slip-resistant aluminum holder, the crayons can be used on steel, iron, aluminum, stainless steel, glass, plastic, and ceramic surfaces in a variety of industries. Part number, temperature and lot code are imprinted across entire crayon stick. Crayons exceed industry standards delivering products free of sulfur, lead, and halogen contaminants.