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My Weller soldering iron is about 50 years old and has its tip temperature always at the correct temperature with no adjustment. Cheap soldering irons use a simple lamp dimmer to adjust the power, not the temperature. Mine does not sit there getting hotter and hotter and hotter melting itself and incinerating the important rosin in solder. If I try to solder something large then it does not cool down like a cheap soldering iron. Its tips last for years when used every day.