What is the difference between the AdventurerOpti and the Protector? Tim Archambault November 08, 2016 11:14 Updated Follow Protector is made in USA and Adventurer is made in China. Other than that, they are pretty much the same device. Related articles What is the difference between Defender, Classic, Traveler & Emergency SteriPENs? Where can I buy a SteriPEN Protector? How far should I immerse the SteriPEN ino the water I'm treating? Which SteriPEN model is the best? Which model should I choose? If I lose the user guide or a part that came with my SteriPEN, how can I get a new one? Comments 0 comments Please sign in to leave a comment.