Schuler Scientific SAS-224 A Series Analytical Balance with 0.1mg Readability and 220g Capacity Internal automatic calibration and adjustment - including temperature-activated calibrations, time-activated calibrations may be programmed, or press the cal key to activate the calibration function 5 Year All Inclusive Warranty Included! Advanced communication features - includes 2 USB and 2 RS232 ports allowing you to connect your balance to a computer, printer or network GLP documentation - is standard on the A Series. Store up to 10 users, 1000 products and 100 tare weight values in memory User-friendly draft shield is standard on semi-micro and analytical models