A proctoscope comprising: a body ; a handle extending from the body ; an elongated element comprising a forward end and an aft end , said aft end is attached to the body and open such that the interior of the elongated element is accessible via the aft end, said elongated element is extending along a longitudinal axis L, at least one opening (5; 5') formed in the elongated element between the forward and aft end, and / or a transparent section formed in the elongated element between the forward and aft end; a reference marking arranged along the at least one opening and / or transparent section, said reference marking is readable via the open aft end of the of the elongated element, characterized in that the proctoscope furthermore comprises a positioning device for supporting the proctoscope in the intended position relative a treatment area, said positioning device comprising: an elongated position adjustment device with a forward end contact surface , said position adjustment device is movably arranged along an axis substantially parallel to axis L in the body and extending from the body in the same direction as the elongated element from the body , and locking means arranged to secure the elongated position adjustment device in a selected position, wherein the forward end contact surface is intended to bear against the skin of a patient to maintain and support the proctoscope in a position along the longitudial axis is L where the treatment area is arranged in the intended position in relation to the reference marking . a body ; a handle extending from the body ; an elongated element comprising a forward end and an aft end , said aft end is attached to the body and open such that the interior of the elongated element is accessible via the aft end, said elongated element is extending along a longitudinal axis L, at least one opening (5; 5') formed in the elongated element between the forward and aft end, and / or a transparent section formed in the elongated element between the forward and aft end; a reference marking arranged along the at least one opening and / or transparent section, said reference marking is readable via the open aft end of the of the elongated element, characterized in that the proctoscope furthermore comprises a positioning device for supporting the proctoscope in the intended position relative a treatment area, said positioning device comprising: an elongated position adjustment device with a forward end contact surface , said position adjustment device is movably arranged along an axis substantially parallel to axis L in the body and extending from the body in the same direction as the elongated element from the body , and locking means arranged to secure the elongated position adjustment device in a selected position, wherein the forward end contact surface is intended to bear against the skin of a patient to maintain and support the proctoscope in a position along the longitudial axis is L where the treatment area is arranged in the intended position in relation to the reference marking . an elongated position adjustment device with a forward end contact surface , said position adjustment device is movably arranged along an axis substantially parallel to axis L in the body and extending from the body in the same direction as the elongated element from the body , and locking means arranged to secure the elongated position adjustment device in a selected position, wherein the forward end contact surface is intended to bear against the skin of a patient to maintain and support the proctoscope in a position along the longitudial axis is L where the treatment area is arranged in the intended position in relation to the reference marking . <EOS>