The Portable Refractor Arm offers the ability to conduct remote subjective refractions with your manual refractor almost any where. The arm can be installed on any flat surface, such as an instrument table, with the permanent mounting plate. In addition a C-clamp adapter (not shown) is available to allow the arm to be temporarily installed any where. Eight different height settings are provided through the vertical support rod and the included extension. Sturdy locking handles assures the refractor stays in position when locked.