iso-tip #7971 solderpro 50 butane soldering iron iso-tip the world's most popular pocket-sized butane powered soldering iron. the solderpro 50 is a manual ignition compact micro butane soldering iron and torch. it can be used as a soldering iron, torch, hot knife or heat tool by using easily interchangeable tips. the solderpro 50 is a multi-function heat tool specifically designed for the hobby/diy enthusiast. the solderpro 50 is completely portable with no electricity required resulting in no electrical interference with sensitive circuits. its performance withstands various weather conditions. the solderpro 50 is powered by easily refillable standard butane fuel. applications include: electronic circuit repair, light plumbing, jewelry making, eyeglass frame repair, model building, arts and crafts, dental wax corrections and thawing frozen locks.