To clean the inside of the tube or a long narrow cavity is not so simple. This can help “brush” like how to wash their bottles, only to make it necessary from segments of a steel cable. The work will go faster if cleaned using a drill, securing it in the Chuck end of “brush”.
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Two LEDs with different color (e.g., red and green), you can build a simple indicator for voltages from 4.5 to 220 V. It is also able to determine the polarity of the source in the range...
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Eyedropper and every home medicine Cabinet; however, due to its shape permanent storage of it, as a rule, no. To eliminate this "injustice", you can use the usual "English" pins,...