Little gadgets and notions - Iron hem gauge

I have seen these being used on a few you tube videos so thought I would give it a go.

This one I got from china, not sure if they are available in the UK I didn't really look.

The idea is that you fold the fabric over and iron so that you get a nice even fold.  I do a lot of things in inches, so would have loved this to be CMs one side and inches the other, but it is just CMs.

Seems to work a treat, but guess better for small projects rather than dressmaking, and not sure it was worth the money.  It wouldn't be on my top 10.