Color Monitor 5.7” · 3 sets of measured data viewable on screen with average power, also printable · Cross check of accuracy of measurement possible. · Diopter steps, vertex distance, cylinder mode, Automatic power off, print mode, date, time, selectable & changeable & optionally remeasurable. · Minimum 2.2 mm minimum pupil diameter measurable. · Owner’s message, address printable on printout. · Very, very, very sturdy model