MDC Water Quality Test Strip 7-in-1 for Seawater and Freshwater, Pool, SPA, Aquarium, and Fish Pond Precision Testing Category: Water Quality Test Paper Certification: CE, ISO Material: PET Test Time: 60 seconds Advantages: Resistant to VC interference Test Parameters: pH, Total Alkalinity, Nitrite, Residual Chlorine, Total Chlorine, Hardness, Bromine Application Scope: Suitable for drinking water, aquariums, swimming pools and spas, industrial water, ponds, and hot spring water Note: - Please allow 0–1 cm error due to manual measurement. - Item color may appear slightly different on computer monitors due to variations in screen calibration. - For any product inquiries, please contact us and we will assist you promptly. Specifications: Name: MDC Water Quality Test Paper 7-in-1 for Seawater and Freshwater, Swimming Pool, SPA, Aquarium, and Fish Pond Precision Test Size: 15 x 5 x 5 cm Weight: Approximately 85 grams Package Included: 1 x Test Paper Strip