LJ Star manufactures the No. 1 selling fused sight glass window, installed in more plants around the world than any other brand. A unique combination of metal and glass formulas make Metaglass sight glasses 4.5x stronger than comparable products. The results are superior safety, a wider operating range, and a long, worry-free service life. Sanitary and Industrial process connections, visual flow indicators, sight glass lights, process vessel cameras, hygienic bubble traps, gauge glass and a variety of sight glass accessories.