I worked with the guys at CNC4PC for about a year testing various versions or several of their torch height controllers.
it was a rough ride at times and frustrating but perseverence paid off.
I fully endorse this product and the team that stands behind it.

I have The THC-2 installed on my homebuilt Plasma table running mach 3 and a PrimeWeld Cut 60 plasma unit. It is equipped with the machine torch.

I've been running this setup for 9 months with zero problems. The THC is as solid as it gets and at less than $250 it's a bargain.
Tech support is fast and they are very knowledgeable about most CNC plasma setups.

You won't be disappointed!