The Starrett HE400-221E Quadra-Chek 221E Edge Detection Horizontal Benchtop Optical Comparator; 34739, 16" Screen, 10" / 254mm X 4 "/ 100mm Travel with Quadra-Chek 221; Edge Detectionoffers a 16" / 400mm Screen with X= 10" / 254mm, Y= 4" / 250mm axis Table Travel, bayonet fitting lenses and Q-axis angular readout, all to improve capacity and performance. This model comparator has all the features of the HE400-121 which means it utilizes compact and precise digital readout for X, Y and Q measurements. It is ideal for displaying linear and angular dimensions. Capable of absolute/incremental measuring, "Q" axis reads out in angular coordinates, readout is equipped with RS232 port communication to a PC, printers can be setup via the USB port. An optional footswtich is available. The HE400-221E has even more measuring capability, including the ability to measure 2D features such as diameters, radius, angle, lines and point features. Part skewing makes setting up quick and easy. Programs can be recorded to speed up the measurement of multiple parts. The HB400 Horizontal projectors are fitted with industry-leading Quadra-Chek digital readout systems as standard, making them simple to use, but having the power to satisfy the most complex measuring requirements. Includes Optical Edge Detection. *Lenses, Options and Accessories SOLD SEPERATELY. Please contact Customer Service to determine the necessary specifications for your needs.