Industrial-grade gauge glass for drum boiler level indication, available in transparent and reflex configurations. Engineered from thermal-resistant borosilicate material to endure high-temperature cycling and internal pressure. Flat design minimizes distortion while reflex variants enhance visibility in low-light conditions through internal prism technology. Critical safety component for steam generation systems, enabling precise water level monitoring to prevent overfill and dry-fire conditions. Compliant with industrial boiler standards and suitable for power plants, manufacturing facilities, and process heating applications.