Safety and Security

Temperature Indicators


Markal Thermomelt® temperature indicator crayons offer economical accurate temperature readings and are ideal for welding and metal fabrication.  Certified Thermomelt® Heat-Stiks® are corrosion resistant for use in nuclear, military, and other corrosion resistant applications.

Thermomelt Certified - Temperature Indicators and Low Corrosion Markers

Certified Thermomelt®

Nuclear pre-certified, accurate temperature indicating stick

Thermomelt - Temperature Indicators


Accurate surface temperature indicating stick