Testing

【Accurate Measurement】Instant lead test kit has high accuracy and fast efficiency, and which can accurately detect the lead content of substances.
【Efficient】Lead testing strips are very efficient, with high test sensitivity speed, and results for most test cases can be obtained within 30 seconds
【Convenient to Use】Shake off the excess liquid the cotton swab by hand, make tip of the swab mustard yellow, quickly use the lead test stick to rub the painted Surfaces for 30 seconds, and observe the color change, easy to use
【Sufficient Quantity】Each lead paint test kit contains 30 lead test tampons, which means can take 30 tests, which is more valuable than any other lead test
【Multiple Uses】Lead test swabs for toys, woodworking, tableware, jewelry, bathtub glazes, pottery, antiques, plumbing surfaces provide instant testing, suitable for most painted cermet surfaces
8,09 € SU AMAZON

For something like an arduino board, Raspberry PI they work very well. The insulated covers over the alligator clips are a nice touch especially when using on a small/cramped prototype board/solderless breadboard.
They are great for testing equipment that requires less that 2 or so amps to run as they are not heavy enough to use for higher current.
The clips are small enough to hook on smaller wires and grip well, and the insulation comes nearly all the way to the tip so you don't cause any shorts.
The wires are flexible, so the clips don't pop off while you're working on something.
You can get two of each color: red, black, yellow, green, and white. The different colors are handy for keeping track of which wire is which when you're testing multiple things at the same time.
9,89 € SU AMAZON