An arm-length glove made of a flexible material for performing maintenance work within sealed housings. An armhole-side end of which can be attached to a flange of a maintenance opening in a gas-tight manner and the hand end of which is freely movable, wherein a hand-grip is located in the hand end. The hand end is telescopically extendable. A camera and a light source are located at the hand end. Furthermore tools and/or sensors are also located at the hand end.