RS-232 Cable Application communnication to computer for downloading recorded data auto buffer recognition Bidirectional RS-232 Cal-due alarms Electrode status oversized liquid display Password protection Takes up less bench space up to 500 point nonvolatile memory with time and date stamp For Use With ION ORP Electrodes with BNC connections pH Includes ATC probe electrode arm fill solution Meter pH electrode power adapter Manufacturers Warranty Length 3 yr