Rein OE Anti-fog Sensor Kit is a solution kit that provides the OE anti-fog/condensation sensor and the OE installation tool, both made in Germany, to make the mounting of the sensor to the windshield as easy and painless as possible. The anti-fog sensor is responsible for detecting moisture on the inside of the windshield for the HVAC system to automatically reduce the fogging effect that can occur. It sits at the base of the rear-view mirror and must be precisely positioned to ensure that the automatic climate control system will work as per design, hence why Rein also provides the installation tool with the sensor. Our OE Anti-fog sensor kit aims to provide the professional repair technician and vehicle owner the peace of mind and trust that is expected from an OE component.