Temperature Indicators: Sticks, Crayons, Strips & Markers for Welding, Inspection & Operations {Precision temperature control distinguishes repeatable, spec-compliant work from guesswork. In fabrication shops, foundries, refineries, power plants and paint lines, teams need quick, visible confirmation that a surface has reached a specific heat before moving to the next step. https://thetasphere43.theideasblog.com/37322332/vpl-sticks-or-vpl-chalks-or-vpl-crayons-or-temperature-stick-an-overview-on-how-things-works