SPECIFICATIONS:  Lens material: glass∮127mm ( 5“)  Diopter: 5 diopter   Light source: 110V-120V/220V-240V AC, T5 22W energy saving compact fluorescent Lamp  Supplied with electronic ballast Standard mount: table bracket 5 diopter (2.25X magnification) glass lens.  Even, shadow-free light under the magnifying lens with 22-watt T5 circular fluorescent tube will make it easier for you to see and enjoy the activities longer.  All metal housing mounted on a spring balanced arm that stays set in any position.   Clamps easily and securely onto most flat surfaces up to 65mm thick.   Dust-proof cover for lens protection.