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You can’t go wrong with Alvin instruments. Well calibrated, reliable and durable. Better than any nylon tip disposable. I love mine and give them as gifts.

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Hand fabricating simple thru hole printed ckt boards for one off and prototypes. Resist pens gave lots of problems with controlling line width and getting a heavy enough line down. These pens, together with the waterproof drafting ink that DEW also sells, are an almost perfect solution for rapid turnaround at low cost.