What other tools would you recommend?

I have the drill bits, power tools and stuff. I what would be the best things to get for measuring the diameter of the plugs when turning on the lathe? What else do you think I may need? I just want to have all the stuff before I start turning.

Thanks for all you help

What other tools would you recommend?

I have the drill bits, power tools and stuff. I what would be the best things to get for measuring the diameter of the plugs when turning on the lathe? What else do you think I may need?
I use a caliper.

What F18 said