Tempil 24423 Tempilaq TL750 Temperature Indicating Liquid, 399C/750F, 2 Ounce 43 different temperature ratings from 175F to 1900F (79C to 1038C) Reliably accurate  melts within 1 percent of rated temperature Easy to apply quick-drying fluid Non-flammable for maximum safety and unrestricted shipment Certification available upon request