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? How far should I immerse the SteriPEN ino the water I'm treating? Where can I buy a SteriPEN Protector? What batteries do SteriPENs take? Which SteriPEN model is the best? Which model should I choose? Comments 0 comments Please sign in to leave a comment.