Profile: YesTek Ltd specializes in the automated optical inspection market. We manufacture scanner based AOI and image comparators. We distribute high specification video microscopes, X-ray & camera based AOI. Automated optical inspection is a necessity in circuit board manufacturing environments. It can take a number of roles on the PCB production line. There are a number of "captive" applications such as accurate component positioning in the pick and place system, or screen checking in the paste printer, and there are also stand-alone functions to which AOI is ideally suited.