Okay, here's the information about two check marks on Tinder messages, formatted in Markdown:
Two check marks on Tinder indicate that your message has been seen by the recipient.
It's important to note that "seen" doesn't necessarily mean the person has read and processed your message. They may have simply opened the chat window. There is no "read receipt" feature that confirms they spent time reading your message.
The two check marks only indicate delivery and opening of the conversation window.