I apologize, but I don't see any ruler or image attached to your message. To answer your question, I would need more context or information about the ruler you're referring to. Could you please provide more details? If you meant to ask someone named Lucy if the ruler belongs to her, you might phrase it like this:

"Lucy, is this your ruler?"

If you have a specific question or need help with something related to a ruler, please provide more details so I can assist you better.