Passsword strength meter validation

You should be able to locate the elements for the verification box just like any other part of your application. Right click on the text (‘Weak’ in your example screenshot), and click ‘Inspect’. You can then create a Test Object that uses and xpath (or some other selection method) to get the element(s) and interact with them.

Can you provide the HTML for the item(s) you are trying to validate? Also, what have you tried already?