The SBI-521 is NTEP approved for 10,000 divisions, class III. Available with seven digit, seven segment, 17mm/ 0.7" LED or six digit, seven segment, 25mm/ 1" LCD backlight. Two full duplex RS-232 serial ports; demand or continuous. Standard features include hold, counting, totalizing, check weighing and percentage. Full front panel configuration with multi-point calibration up to four points. Built-in non-volatile real time and date. Housed in heavy duty stainless steel IP65 with stainless steel swivel stand. Operates on AC/internal battery (included).