590DC Battery Powered Digital Weight Indicator Features: Full Numeric Keypad, Keyboard Entry of Piece Weight, Tare Weight, Calibration and Sample Size, Powered by 6 C-Cell Alkaline Batteries for Complete Portablility (Batteries not Included), Power for Four 350ohm Load Cells, EDP Port for Full Duplex, RS-232 Communications, NEMA 4X/IP66 Stainless Steel Enclosure, Large 1" LCD Display, AC Adapter for 115 or 230 VAC Power, Standby Mode. NTEP Certified.