Tempilstik temperature indicators provide an inexpensive and convenient method of achieving accurate surface temperature measurements across many welding and fabrication applications such as pre-heat, interpass, annealing and post-weld heat treatment (PWHT). To use simply mark the workpiece with the Tempilstik and when the nominated temperature is reached the stick will melt on the surface to provide a visual result. Temperature Options: 50°C / 122°F to 600°C / 1112°F. Lead and sulphur free Quantity: Each