The V-ZPL-HITEMP pinhole lens series feature stainless steel housing for extreme durability in harsh environments. High temperature operation, up to 10 minutes at 1000° C with sapphire and quartz front elements. Will withstand impact from scatter sand at high temps. Extreme durability from gravel impact. New 323mm overall length models are designed for industrial process high temperature environments where observation windows are structurally recessed.