Multimeter can be said to be an essential instrument for electricians, but also to carry out maintenance tools, we often encounter some family circuit failure in the daily learning and living environment, the only thing on hand is through a national digital multimeter, how to test pcb bo ...
When you pick up a watch and take a closer look, you will notice that even a clean, empty dial (with hands and time markers, of course) may have markings to fill in the "gaps" on the surface. Engraving is definitely a real technique. It involves using an ordinary engraving knife to ou ...
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