OT skills guide: Dispensing a handmade frame 

I have an optica in brazil here in sao paulo I want to know how to buy a scale like the ones you used

Dear Dr. Sally Bates, can you please let me know where can I find literature for reading about Crest height, Bridge Projection, DBR at 10 and 15, Apical radius, etc. I was watching your videos and think they are amazing. Thank you for your time and please help me with this information if it is possible because I was looking for these but did not have any results.

From where we can buy this scale/ruler?

Not understand please show with body with length weith n hight it very nice I want make it please show model struchar with mazar

How/where can I order the measuring device?