The A&D Apollo GX-L & GF-L Series Precision Balances Ideal for Heavy-Duty Weighing In Tough Industrial Conditions is the successor to A&D’s long-selling GP series, continues to allow precise weighing of heavy or large amounts of materials in demanding conditions. In addition, now as part of the A&D Apollo family, these models also offer various advanced features that make your weighing easier and more efficient, not to mention more accurate.