All LED Insta-Line Quantums use light emitting diodes (LEDs) to provide uniform illumination for standardized testing. Used for testing visual acuity at 10' and muscle imbalance. Includes LEA Symbols® Test Set, LEA Numbers®, E Chart, Letter Chart, and HOTV Test Set, Occluder, +1.75, +2.25, and +2.50 hyperopia glasses. Completely self-contained and weighs only 10 lb.14.5"H x 9.25"W x 5"D