Pipe bender markings

[Mikele21]

I'm new to plumbing, I recently bought a pipe bender along with various other plumbing tools. However I'm not sure how I should mark the 30, 45 and 90 degree marks on the bender, at college the benders had 3 marks to show where you were bending, the bender I have is blank, and Im not sure how to accurately mark the bender, any help would be appreciated, thanks

 

[ShaunCorbs]

i do it all by eye but if your starting out these vids should help you

https://www.youtube.com/watch?v=14nPHPpml1c

 

[Dotty]

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