Backpacker Editor's Choice 2011. Germicidal UV light destroys viruses, bacteria and protozoa. 8,000 treatments. Purifies 0.5 L (16 oz.) of water in 48 seconds or 1 L (32 oz.) in 90 seconds. Pocket size rugged purifier weighs only 3.6 oz. with 2 CR123 batteries (included!). Optical water sensor also serves as integrated LED flashlight.
The handy Steripen Adventurer Opti is powered by lithium batteries and can be used to treat 0.5 or 1.0L of water. This small UV water purifier weighs 103 grams and can easily be stowed in your travel pharmacy or backpack. The Adventurer Opti has a capacity of around 8000 uses before it needs to be replaced. Ultraviolet (UV-C) light rays safely purify clear water by destroying 99.9% of protozoa (including Giardia and Cryptosporidia), bacteria and even viruses The revolutionary optical water sensor doubles as an integrated LED flashlight. Hold down the activation button for three seconds to illuminate the darkness When the treatment is complete, LED indicators flash to let you know that the water is safe to drink. Use only on clear water, as cloudy, sediment-laden water hinders effectiveness.