.single-film,double-films,three-films and four-films,optically controlled,uniform and soft screen to protectyour eyes. Technical specifications model N-5001 1-Section N-50022-Sections N-50033-Sections N-50044-Sections Net weight 5kg 9 kg 16 kg 21.5 kg Gross weight 7kg 11 kg 18.5 kg 24.5 kg Frame size (w×h×t)mm 504×502×25mm 884×502×25 mm 1265×502×25mm 1646×502×25 mm Viewing area (w×h)mm 362×440 mm ...