Product Specification For the examination of the anterior segment compact and lightweight, the portable HSL 150 is ideal for situations where a full size slit lamp is not available and convenient. Slit size adjustable from 0.2mm×10mm to 4mm×14mm. 6 × magnification. Blue interference filter (FITC), can be selected for corneal examination. Multi-coated optics for maximum light transmission. 2.5 V or 3.5 V XHL Xenon Halogen Technology for bright, white light comparable with the brightness of a classic slit lamp. Can be operated with large battery handle or re-chargeable handle.