1. Home
  2. Temperature
  3. Colotemp Crayons


  • Check Surface Temperature
  • Measurement of Operating Temperature
  • Easy to Use – Non-Toxic
  • Accurate ±5°C
  • Temperature Range – 120°C to 600°C
  • 1 crayon holder per box of 10

Colotemp Crayons

Irreversible crayons change color when applied to pre-heated surfaces that are idea for production processes in Aluminum, Zinc, Textiles, Plastics, Glass, and Enameling. Easy to Use, Non-Toxic, Accurate Colotemp Crayons. Temperature Range 120°C to 600°C.


  • Mark preheated surface where the measurement is desired
  • Immediate color change indicates that the measurement surface is higher than the crayon rating
  • A color change after two seconds indicates that the measurement surface is lower than the crayon rating
  • Accuracy ±5ºC


  • Metal Working
  • Heat Treating
  • Welding
  • Aluminum
  • Zinc
  • Textiles
  • Plastics
  • Glass
  • Enameling
Initial ColorColor ChangeColor ChangeColor Change
120°CLight GreyViolet Blue at 120°CNo ChangeNo Change
245°COrange BrownBlack at 245°CLight Grey at 335°CWhite Buff at 505°C
600°CWhite at 600°CNo ChangeNo ChangeNo Change

Get In Touch

Have questions? We’re here to help!


Contact Us