Internal calibration weight, Auto environmental compensation, IP54 splash-proof operator keyboard, RS-232C bidirectional interface, WinCT communication tools software, GLP/GMP/ISO compliant to either AD-8121 printer or computer. Transmits date, time, ID number, serial number and calibration data, Auto re-zero function, Interval time setting; built-in time and date, Rechargeable battery option for portable needs, Data memory function, Multiple weighing modes: Counting, Percentage, and Comparatormore Modes, Super Hybrid Sensor Technology (SHS), Vacuum Florescent Display (VFD), Optional glass breeze break, Under hook weighing less