The Salter-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 Salter-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 RS-232 port. It also interfaces to most electronic cash registers and point-of-sale software programs.