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, Hot Springs Note: - Please allow 0–1 cm variation due to manual measurement. - Color may slightly vary depending on monitor calibration. - For any product inquiries, please contact customer service. 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