I earned my Bachelor Degree in Engineer. I suppose I should get my job related to my study. But I end up with a Automobile mechanic. If you live in California, you will familial with Smog Check. My shop is a Smog Test Only Station. Which mean there is no repair allowed. You can see all the pictures on this page of how smog machine look like. It's cost $60,000 dollars for this smog machine. That's cause smog check price gone up high.