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When soldering electronics the temperature of the solder iron tip is very important. It is also not easy to measure with a K-type thermocouple, since the K-type wires do not wet out with liquid solder, but rejects it and does not make a good contact with the liquid metal. The standard to measure the tips of solder irons is the Hakko FG-100B tester. But it has s pretty large thermal mass and 3 wires that lead off the heat from the tip. In my eyes not ideal.For a long time I wanted to make a simpl …