Selecting professional-grade tools requires focusing on material durability and precision. For screwdrivers, prioritize S2 steel bits over chrome vanadium, as S2 offers a higher hardness rating (HRC 58-62), preventing stripped screws. Ensure the handles feature 360-degree swivel caps and ergonomic non-slip grips to facilitate delicate maneuvers. For opening tools, look for high-toughness carbon fiber spudgers and ultra-thin flexible stainless steel pry pieces (0.1mm) to avoid damaging internal ribbons or scratching the device frame.