Foresite's C3 "Critical Cleanliness Control" is unique among electronics cleanliness testers. It remains the only tester on the market that indicates whether a specific or critical area of a PCBA is clean. We often select the components or areas of circuitry that are most sensitive and prone to contamination-related and test an area that is 0.1 in2 or smaller for customers. The C3 equipment can give immediate "clean" or "dirty" reading based on Foresite's recommended limits for ionic contamination.