If you are looking for a professional and water quality test strip, then your research is over here. That's because our product can meet your need. Adopted of , it is practical and durable for long time use. Features -Color: White -Material: Paper -Size: Approx. 10.50X4.00X4.00cm / 4.13X1.57X1.57in -Easy to operate and test, just need to Simply dip water and compare with large color chart designed on bottle. -With large quantities, which can meet your different using and replacement needs. -These test paper are professional, which are designed for testing the water quality in swimming pool, fish tank or others. -Get your results quickly and easily whether water from your tap, well, filtered, or any other water source. - material and fine craftsmanship, durable and sturdy for a long time. Package list: 2 of Test Strips (100Pcs /Box)