You have just started work as an intern in the purchasing department of Westridge Laboratories, an independent materials testing lab. You do not know much about the business, but your supervisor has given you the task of learning more about gas chromatographs, an instrument that the labs use for several regular tests they conduct. Use the Thomas Net Web site to locate at least three of these lab instruments and write a report that describes them, including their prices, specifications, and the vendors who sell them.