Maybe I'm using it wrong but the tester on my truck is upside down, not critical but stupid. The connector cleaner teeth are too tight, I feel like I am about to pull out the connector. I think (that I used) a small piece of fine mesh sandpaper is sufficient. It's very expensive for what it is. female end, the file is not suitable for cleaning the female end. I get it and I think the tools are a great idea, but they don't work for me.
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