The Harvest Acuity Eyechart is available as a full-size system (VisionSys-EM) or as a small tablet based unit (VisionTab-970). The full-size system has a 23 inch LCD monitor and can be calibrated to any lane up to 30 ft, while the 10" tablet is best suited for smaller lanes (<14 ft). Both systems can be calibrated for their lane, have the same rich chart set, and operate from the same remote control.