4.1 Identify the purpose of various types of preventive maintenance products and procedures

4.2 Identify procedures and devices for protecting against environmental hazards

4.3 Identify the potential hazards and proper safety procedures relating to lasers and high-voltage equipment

4.4  Identify items that require special disposal procedures that comply with environmental guidelines

4.5 Identify ESD (Electrostatic Discharge) precautions and procedures, including the use of ESD protection devices