If you had to mark several points (for drilling them) on the edge of a MDF sheet (for exemple), you know that mark them precisely on the center of the edge can take some time (depending on the sheet thickness, it can be even complicated). Using this tool, the marking task turns into an easy one.

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Anyone that worked with soldering knows the process releases some fumes. Those fumes can be considered toxic containing, even traces of some heavy metals like lead. When you work with electronics as a professional, the ideal is to use a professional fume extractor. But these devices are a bit expensive to an amateur as me. I used to blow the fumes away but, after some time, I got tired of that and decided, in the best DIYer tradition, to make my own fume extractor.
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