Description This is a pool water quality tester. Made from good material, it is durable for long time use. Suitable for PH level in the swimming pool. It is convenient and easy to operate, it doesn't need too many steps. Are your good choice. Features -Color:Assorted Color -Material:Paper -Size:6.50X0.40X0.10cm/2.55X0.16X0.04in -Note: Suitable forph4.0-9.0. -The test strip has high precision, fast, convenient carrying, which will be a helpful assistant for you. -Suitable for the pond, aquariums, swimming pools and spas, very practical. -No need to be a professionals, you can also get your results quickly and easily. -Good material and fine craftsmanship, durable and sturdy for a long time. -With large quantities, which can meet your different using and replacement needs. Package List50 x Pool Test Strips