... learn & use 2.No anesthesia, avoiding discomfort reaction 3.Wireless data print 4.Light & handy rebound tonometer, tonometer, portable tonometer ... # W500With vertical and horizontal two working modes, wireless output print data. The equipment is used to measure intraocular pressure, ... can go along both in standing and lying posture7.Wireless data printing8.Esay to learn ,easy to use9.Lightweight ...