Product name: Pool test paper Product size: 50pcs Product color: As shown in the figure Product material: pH test paper Product features: Multifunctional water quality test: can test the pH value of water, residual chlorine, free chlorine, nitrate and so on. Easy and fast: Just dip the test paper in water and read the results after a few seconds. High accuracy: Provide accurate water quality data to help you adjust water quality in time. A variety of specifications: there are 4 in 1, 5 in 1, 6 in 1, 7 in 1 and other different specifications to choose from. Wide range of application: suitable for swimming pools, aquariums, hot springs and other water quality detection. Precautions: 1. As we all know , the different computers display colors differently, the color of the actual item may vary slightly from the following images. 2. If you feel difficult to choose the size, you can feel free to contact mewe will give you some suggestion, but it is for you reference only. Shipment includes: One bottle 50pcs Pool test paper