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Reference.org
Scope soldering iron
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<p>The "Scope" soldering iron is a tool for soldering with <a href="/facts/Solder/GBvJH75t">lead-tin alloys</a>, made in Australia since 1950, and intended for occasional or intermittent use. It has the virtue of quickly coming up to soldering temperature (~300C) and delivering considerable heat to a small area, but requires care to avoid overheating. It operates on low voltage (3–6 V) and high current (tens of amps) from a battery or suitable transformer, so is by design electrically safe, and as it cools down rapidly when it leaves the operator's hand, should not constitute a fire risk. </p>