They have some
plug in black light fixtures about 12"...Thats
the one I have and it works great!!....

You may want a small hand held one that you can take to the casinos with you. If you are looking for a specific mark you can purchase a rack and go someplace dark to look at them all. Just don't let securtiy see you doing this or they may ask a few questions. If you are staying at the hotel you can take it back to your room.Barry