Quote: "This cool tire gauge has a bright display and built-in LED flashlight. It's branded with our logo to remind you to wash your car with us. And the gauge is free for you! Just fill in our short survey. No strings attached."

http://tampagpcarwash.com/freeledtiregauge.html

Although I've received reports that this company Does occasionally actually send something out- I have yet to receive anything from them.