Analytical balances are used to weigh liquids, powders or crystalline matter to a very high degree of accuracy and precision. They have a stainless weighing pan enclosed within an airtight and dust-proof glass enclosure known as a draft shield or wind break to protect the weighing from external air movement. Multiple weighing units and other advanced features include stability indicator; overload and underload indicator; auto standby. Other features include Easy access communication ports including standard USB and RS232 and an optional third port of either RS232 or Ethernet. GLP/GMP Data Ouput with Real Time Clock. Data Transfer Function. Internal calibration allows the user to regularly check the balance calibration. All the analytical balances below have some or all of these features.