Various values in the pool are important to maintain optimal water quality. The Pool Improve Handheld Photometer POL01 can easily read up to 9 water quality parameters at once: pH, free chlorine, combined and total chlorine, alkalinity and cyanuric acid (stabilizer) and more.The photometer POL01 is compact, waterproof and durable, with an IP rating of IP 67. Thanks to Bluetooth 4.0 and mobile App (for iOS and Android) connectivity, the photometer has various ways to transfer data for online use and storage. A replacement cuvette can be ordered separately.Features: Exchangeable cuvette (test tube for water samples) 6 buttons for direct access Measures 9 water quality parameters IP rating: IP 67 Waterproof With Bluetooth 4.0 and mobile app connectivity