Benefits include:

5 FNU or 5% of reading (whichever is greater)

great-tasting water in a compact size

Portable & Convenient: Compact pen design fits in your pocket for on-the-go testing

✅ Automatic Temperature Compensation (ATC): 5°C to 50°C (41°F to 122°F)

Aquamira Series II RED Line Replacement Filter | Virus, Bacteria & Cryptosporidium | 120 Gal | Frontier Flow digital pen tester Benefits include:Aquamira Series II RED Line Replacement Filter for Frontier Flow When adventure takes you off the grid, the Aquamira Series II RED Line Filter keeps your Frontier Flow bottle performing at its best. EPA certified and built for international travel, backcountry hiking, and emergency preparedness, this replacement filter delivers serious protection in a compact, lightweight package. Filtration Performance Removes virus, bacteria, Cryptosporidium, and