How to judge the quality of SMT surface mount machine suction nozzle

How to confirm the quality of the SMT surface mount machine suction nozzle, mainly judged from the following 5 points: 1. Good suction nozzle "in good condition, with normal color 2. The suction nozzle end face is not worn, blocked, broken, etc." 3. Wear and whitening of the suction nozzle can cause defects such as missing parts/multiple parts, missing parts, offset, vertical pieces, and material throwing 4. Damage and missing corners of the suction nozzle can cause defects such as missing parts/multiple parts, missing parts, offset, vertical pieces, and material throwing 5. Wear and dirt of the suction nozzle can cause defects such as missing parts/multiple parts, offset, vertical pieces, and material throwing