LinuxCNC tool length touchoff

In this video I am demonstrating how to touch off tools in LinuxCNC using the Axis interface. I've observed that there are no manual touch off videos available for LinuxCNC and that they are all requiring a probe. That's cool and all but if someone dose not have one of these probes and only a finger dial indicator tool touchoff is still possible. This is setting tool length offset and is used for running programs that use multiple tools and G43. Please write comments and ask questions I will answer them as best as possible. Thanks