The Heine Lambda 100 is the first compact, hand-held instrument for assessing potential visual acuity of patients with cataracts and other opacities. Simple, easy-to-use controls: Reliable diagnosis, easy to operate. The instrument fits onto battery or rechargeable handles: Complete mobility-no dependence on the slit lamp. Compact, lightweight (100g): Can be used anywhere-even at the bedside. HEINE XHL Xenon Halogen bulb brightness: Avoids patient discomfort from dazzle. Very affordably priced: A good investment for any practice. Twist Lock connector: Compatible with all Welch Allyn 3.5V systems.