Tempilstik 28068 Surface Temperature Indicator, One Indicator, 1600 Degree F Accurate results are +/- 1 percent of rated temperature; reliable always in calibration Easy to use melts at designated temperature for easy visual inspection Superior quality free of contaminants such as sulfur, lead and halogens Traceable each marked by temperature, lot number and is nits traceable Complain meets awes D1.1, same code sec. I, iii and viii, anise/same code B31.1 and B31.96