This is a great item to have. Many times I have wanted to measure my ring fingers or my husbands and have had to use string (very inaccurate) or find a shop that has a sizer (very embaressing, especially if you don't purchase).
It is also handy to have if you are wanting to buy a suprise ring for someone, just get a ring of theirs and measure it with the stick.
Good quality plastic product, I feel would be more durable over time.
An investment for any at home ring sellers or small businesses.