Fluke IR Windows are the most rugged on the market, with a heavy duty aluminum housing and arc-flash resistance to increase safety when conducting thermal inspections. Engineered and tested to withstand electric-arcs up to 50 kA for 30 cycles. Certified by UL and CSA for Type 3/12 (outdoor) environments in North America, these C-Range windows are tested to withstand the long term aging effects of UV exposure. Certified by SIRA Certification IP65 (outdoor) environments in Europe. The CLIRVU coating-exclusive to Fluke IR Windows-seals the optic prior to assembly to protect against moisture degradation. The Quadraband optic is IR-Fusion compatible, allowing the thermographer to see potential problems in visual light and thermographic mode. Each C-Range window is delivered with an identification plate attached for unique, on-site numbering for rapid location confirmation and faster repairs. Each infrared window comes complete with a security access key, installation instructions and self-adhesive drilling template. Maximum temperature: 659 degrees C. Warranty: lifetime replacement against manufacturing defects.