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We bring forth an impeccable spectrum of Thermal-pen / Chroma-pen Temperature Indicating Crayons, which is a surface temperature indicating crayon. These thermal-pens indicate accurate surface temperature by altering chalk mark into the liquid smear. These are instrumental in determining preheat and post-heat temperatures during welding, annealing and stress relieving of metal fabrication. Moreover, operating temperature of steam traps, molds, transformers, motors, glass blowing, electronic components, heat transfer applications and hydraulic systems can also be recorded using these crayons.