Hach DR300 Pocket Colorimeter × EXTECH PH Chk Chlorine, Free SHIP!
Im no expert. I have no pool because I swim at the beach. You receive two items! Extech PH checker. HACH Chlorine DR300 POCKET COLORIMETER. The units turn on. You see what you will get in the box. Comes with many apparent chlorine checking straps in the blue container along with empty viles. Both instruction manuals!