Inverted Teaching Microscope Add-On Observer ArmsInverted Teaching Microscope Add On Observer Arms Options Order code Description Details T 1 Singe Observer Arm Add On for Inverted Teaching Microscope One single observer column, single 10x eyepiece pair T 2 TWO Single Observer Arms for Inverted Teaching Microscope Two observer columns for teaching microscope, two 10x eyepiece pair Two seperate observer columns for use with the inverted binocular trinocular teaching microscope. These observers are a