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I just work in a repair shop, there are a lot of tools in the shop. A lot of them are come from china because they are cheap. But I don't know how to use them, so I'm here to ask for help. Members predecessors, the boss gave me some days to learn how to use a tool for GM named gm tech 2 scanner. But it's hard for me because he didn't give the detailed instructions, and I don't know a lot of what it say in the internet. Could you help me?