AquaChek® 541604APP Select® Connect 7-In-1 Test Strip Kit with Mobile Testing and Record Keeping App 50 Count. Want to add savvy to your pool maintenance knowledge? AquaChek Select Connect is our most comprehensive test for checking water quality and includes a handy guide that teaches you how to treat your pool. The free, user-friendly app uses innovative photo capture technology to digitally scan the test strip and provides a personalized water treatment recommendation. No registration required. Download the AquaChek Smart app and simplify pool and spa water maintenance.