A radar sensor for measuring a fill level and/or a point level of a product in a container is described, including a sensor configured to emit and/or to receive a radar signal; evaluation circuitry configured to determine a measurement signal; a housing having at least one housing region configured such that the radar signal can be transmitted through the housing region; an adhesive surface including an adhesive material, configured to attach the radar sensor to the container wall, is disposed on the outside of the housing at least along a portion of an outer circumference of the housing region, and a sealing surface including a sealing material configured to at least partially seal the housing region when the radar sensor is attached to the container wall, the sealing surface being disposed on the outside of the housing at least along a portion of the outer circumference of the housing region.