Can a user input a number instead of using slider with Human UI?

I’m new to the Human UI but I was wondering, is there a way for a user to input a number instead of using a slider in the interface? We jewelers generally know what millimeter sizes we want rather than fidgeting with a slider, I find myself clicking the slider and entering the data anyway.

Sure, you can use a Create Text Box component. You could also use a List Box or Pulldown if you have a set number of standard sizes that you always use.