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Refrigerant analyzer, tells me when Homer Simpson or Beavis and Butthead worked on your car before. Contaminated refrigerant or 2,3,4,5,6,7,8% air mixed in your A/C system because of no or poor vacuum when recharging. I test every system I test every car now and ask the customer what the name of the shop who worked on your car. After many years you get to know who are the bad shops in town. Y see the same ones making the same mistakes over and over. A high % of air many times has the shop replacing parts ( guessing ) what is wrong, and the customer is paying the price and the shop makes money off bad guess. If I test between 5 to 8 cars every day, 1 to 3 of them will have a high % of air. Shops that use the little cans to recharge are the worst!!. A analyzer is a good diagnostic tool against bad shops.