WTSF 80 Feed Unit The WTSF 80 Feed Unit is an automatic solder wire feed unit that serves as a "third hand" for manual soldering processes and enables precise soldering results through consistent and preset solder supply. It is ideally suited for working on circuit boards, wiring harnesses, connectors, and switches. The unit offers various modes such as timer and pulse mode, to always precisely dose the desired amount of solder, ensuring consistent and repeatable results. The insides of the feed tube are coated to prevent the flux from sticking and to reduce maintenance costs. Additionally, the device features a start-stop/standby function.