Opti-Logic Laser Range Finder w/ RS-232 Serial Computer Interface Ports - is a part of the high quality and dependable Range Finders from Opti-Logic. All of the features you need for a price you want. Range Finders from Opti-Logic are well known for their quality and Opti-Logic Laser Range Finder w/ RS-232 Serial Computer Interface Ports - upholds that standard.