The ST 500 is an adjustable Z-Axis platform that accepts the handpiece from either the ST 300 or ST 325.
The heat guard on the handpiece is replaced with a swivel ring which is placed on the ST 500. The swivel ring
allows the handpiece to be adjusted for planarity to the PCB being worked on. The ST 500 features a sturdy, extruded
base that will accommodate either the ST 400 or ST 450 preheater and can also be used with either of the PCB holders
(ST 525 or ST 550.