quality: Made from durable plastic, this water tester provides reliable measurements of pH, RH, temperature, EC, CF, and TDS (ppm) for pools, spas, and hot tubs. Large display: Easytoread screen shows pH and chlorine levels clearly for quick, accurate readings. Versatile use: Suitable for home pools and spas as well as laboratory testing, including drinking water, aquariums, tap water, hydroponics, spa maintenance, and basic scientific experiments. How it helps: Maintains water balance, supports safety and comfort, and reduces chemical waste by enabling precise dosing. Usage notes: Regular testing and adjustments are essential to keep water clean and safe. Chlorine is important for disinfection but should not be used in salty water. Use scenarios: 1) Weekly pool maintenance: monitor pH, chlorine, temperature, and conductivity to optimize chemical dosing. 2) Aquarium or hydroponics: keep pH and conductivity within suitable ranges for plants or aquatic life. 3) Home drinking water or spa testing: verify water quality for safety and comfort.