The Brecknell 6720 is a standard point-of-sale interface scale for linking to electronic cash registers or POS systems. It features a six digit LCD external display with large 0.5" characters, and tactile keys. The Brecknell is accurate and reliable since it's electronics ensure repeatable weight measurements and troublefree operation. The 6720 is easy to install because of it's Bi-directional 9-pin RS232 port. It also interfaces to most electronic cash registers and point-of-sale software programs.