Intelligent-Lab Milligram Balance?PM series high precision milligram balance features large, analytical type glass draft shield, configurable RS232 interface. Its easy to read with backlit LCD display. CalQuick single button calibration weight supplied Calibration is simple, ensuring that the balance will be calibrated often during use. Large glass draft shield with anti-static construction allows for weighing of large objects such as flasks, while maintaining protection from environmental conditions. Includes 1 Year Warranty