Archon Industries' TempBoro Disc Sight Glass—3.7 inches in diameter and 0.625 inches thick—uses borosilicate glass for a clear, heat-resistant viewing window. It functions as a sight glass, providing a viewing port for monitoring contents inside sealed vessels or equipment. Typical uses include process vessels, reactors, or other installations where a transparent window is required to observe flow, level, or reaction indicators without disassembly.
