Elenco  Capacitor Substitution Box Soldering Kit with Iron and Solder Hone your DIY soldering techniques on the Capacitor Substitution Box Soldering Kit Enjoy the pleasure of having assembled and soldered it yourself Values selected for your capacitance substitution box were determined to be the most commonly used in modern solid-state circuits Values range from 100pF to 1F in 24 steps Includes: PCB, electronic components, instruction & 25 watt soldering iron, stand and lead free, rosin core solder PCB measures 865mmX1016mmX16mm Add this kit to your STEM curriculum From the company that brings you Snap Circuits - 9 volt battery not included