The Grafton Retinoscopy Rack is useful for a speedy objective refraction, particularly for children and adults who might require extra attention.
 
Two strong plastic racks - 1 red and 1 black
0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10, 12 and 15.