SE - Eye Loupe - Illuminated, Plastic Body, 10x, 20mm - MI120LL Lighted Loupe For when you need things big and bright. The acrylic-lensed eye loupe has an adjustable white LED attached to the side, powered by a button cell battery that's included and replaceable. The lens is just under 7/8" dia on a 1" long loupe with a 1-1/4" eye port. The package says 10X, but it looks more like 5X to us, which is still good for a loupe. The battery life for the light is approx 22 hours.