Inspector Gadgets

While sampling systems are very good at recognizing repeat defects, they aren't as reliable at detecting random defects. However, said Stern, "Sampled systems have higher resolutions and more time to make an intelligent decision about defects. The limitation is the inability to find sporadic defects. One hundred percent systems have lower resolutions and less time to make a decision, but can find sporadic defects. Sampled systems can detect the birth of a defect allowing corrective actions to be taken avoiding waste, thus are excellent tools for process control. One hundred percent is ideal for final inspection applications where zero major defects is required."