100pcs/box 7in1 PH Test Paper Full PH Meter PH Controller Indicator Litmus Tester Paper Water Pollution Factory Swimming Pool Category: Water quality test paper, other Certification: FDA, CE, ISO Material: PET Test time: 60s Advantages: ability to resist VC interference Test items: PH, total alkali, nitrite, residual chlorine, total chlorine, hardness, bromine Scope of application: suitable for drinking water, aquarium, swimming pool and spa, industrial water, pond, hot spring water 1.Please allow 0-1cm errors due to manual measurement. 2.Item color displayed in photos may be showing slightly different on your computer monitor since monitors are not calibrated same. 3.If you have any questions about the product, please contact us, we will patiently answer for you! Specifications: Name: MDC water quality test paper 7 in 1 seawater and freshwater swimming pool SPA aquarium and fish pond precision test Size: 15*5*5cm Weight: about 85 grams Package Included: 1*ph test paper Specifications: Name: MDC water quality test paper 7 in 1 seawater and freshwater swimming pool SPA aquarium and fish pond precision test Size: 15*5*5cm Weight: about 85 grams Package Included: 1*ph test paper