... Automatic Arm 360 Rotation supported Promotion, high cost performance Ophthalmic unitCE, FDA, ISO, 18 month warrantyAutomatic Arm360 Rotation ... simple structure, good performance, and easy operation.Hand-operated phoropter arm can swing up and down, left and right ... 90 degrees’ rotation.Sliding table to accommodate two instruments.Table instrument voltage selectable, 3V, 6V, 9V, 12V, and 24V ...