Fluke CV301 ClirVu IR Window 75mm for Thermal Imager Inspections with Key is an indispensable safety device for technicians in high-voltage electrical environments that need to avoid the dangers of open panels and the inconvenience of full PPE gear while doing high-quality thermal imaging work. Fluke CV301 ClirVu is designed with the exclusive Fluke Clirvu technology that seals the optics before construction, creating an effective defense against moisture damage from high heat or cold. The Fluke CV301 is easily installed using one standard Greenlee punch, uses patent-pending AutoGround to automatically and instantly ground the window to the metal enclosure, is set up for security key access, and greatly reduces arc-flash risk for safer inspections.