Thermex is an economical temperature-sensitive indicator paper that reveals a relative temperature and pressure profile from 200 to 300°F. The paper turns a light blue at the low end of the temperature range and black at the high end. Sensor Products LLC, East Hanover, NJ• Temperature Range 200° F to 300° F (90° C to 149° C) • Dimensions 18 x 13 (45.7 x 30.5) • Thickness 2 mil (0.05 mm)