A gas insulated switching device and a portable observation system, the gas insulated switching device comprising - - a gastight housing, and - a gas insulated medium voltage switchgear; wherein, switching means are mounted in the housing of the switchgear; wherein, the housing of the switchgear comprises an optical window wherein, the housing of the switchgear comprises support elements with magnetic rings or magnetic elements; wherein, the portable observation system comprises a camera, a portable display, a light source, a power supply and a portable case, and wherein the portable case is configured to transport the camera, the portable display, the light source and the power supply; wherein, an adapter for the camera and an adapter for the light source comprise complementary magnetic means to the magnetic rings or magnetic elements of the support elements; and wherein the adapter for the camera and the adapter for the light source can be attached to and detached from the support elements wherein, the light source can be attached to the housing via attachment of the adapter for the light source to a support element to illuminate contacts and/or contact positions of a switch or switches of the switching means through the optical window; wherein, the camera can be attached to the housing in precalibrated optical and mechanical position via attachment of the adapter for the camera to a support element to image the contacts and/or contact positions of the switch or switches of the switching means through the optical window; wherein, the portable display is configured to display the contacts and/or contact positions of the switch or switches of the switching means made visible by the camera; and wherein, the light source and camera are electrically connected to the power supply. - a gastight housing, and - a gas insulated medium voltage switchgear; wherein, switching means are mounted in the housing of the switchgear; wherein, the housing of the switchgear comprises an optical window wherein, the housing of the switchgear comprises support elements with magnetic rings or magnetic elements; wherein, the portable observation system comprises a camera, a portable display, a light source, a power supply and a portable case, and wherein the portable case is configured to transport the camera, the portable display, the light source and the power supply; wherein, an adapter for the camera and an adapter for the light source comprise complementary magnetic means to the magnetic rings or magnetic elements of the support elements; and wherein the adapter for the camera and the adapter for the light source can be attached to and detached from the support elements wherein, the light source can be attached to the housing via attachment of the adapter for the light source to a support element to illuminate contacts and/or contact positions of a switch or switches of the switching means through the optical window; wherein, the camera can be attached to the housing in precalibrated optical and mechanical position via attachment of the adapter for the camera to a support element to image the contacts and/or contact positions of the switch or switches of the switching means through the optical window; wherein, the portable display is configured to display the contacts and/or contact positions of the switch or switches of the switching means made visible by the camera; and wherein, the light source and camera are electrically connected to the power supply. wherein, switching means are mounted in the housing of the switchgear; wherein, the housing of the switchgear comprises an optical window wherein, the housing of the switchgear comprises support elements with magnetic rings or magnetic elements; wherein, the portable observation system comprises a camera, a portable display, a light source, a power supply and a portable case, and wherein the portable case is configured to transport the camera, the portable display, the light source and the power supply; wherein, an adapter for the camera and an adapter for the light source comprise complementary magnetic means to the magnetic rings or magnetic elements of the support elements; and wherein the adapter for the camera and the adapter for the light source can be attached to and detached from the support elements wherein, the light source can be attached to the housing via attachment of the adapter for the light source to a support element to illuminate contacts and/or contact positions of a switch or switches of the switching means through the optical window; wherein, the camera can be attached to the housing in precalibrated optical and mechanical position via attachment of the adapter for the camera to a support element to image the contacts and/or contact positions of the switch or switches of the switching means through the optical window; wherein, the portable display is configured to display the contacts and/or contact positions of the switch or switches of the switching means made visible by the camera; and wherein, the light source and camera are electrically connected to the power supply.