Ive had this Price CNC torch height controller to build with and never did, looks like a great unit, not sure if it runs or not could be great for replacement parts or customization for your cnc plasma cutting machine. By measuring changes in the Arc Voltage, the AVHC10 can determine if the torch needs to be raised or lowered to maintain an optimum arc length. The AVHC10 sends raise and lower signals through your breakout board inputs to Mach3 (or linuxCNC), which adjusts the Z-axis position. This height controller has 30 memory slots to store and load your favorite settings for different material thicknesses and types. Connector for 50:1 voltage input only (No Raw Arc option). Rubber Feet and mounting screws for the AVHC10. Connector to link Isolation Module to AVHC10. What else will I need? Not much if you have a new or existing Plasma CNC table running Mach 3, Linux CNC or similar.