[6 in 1 Test Strip] Our strip can measure total chlorine, total chlorine/free bromine, pH, total alkalinity, cyanuric acid, total hardness. [Quick result in 17 seconds] Immerse the pool test strip in water for 2 seconds. Shake gently to avoid confusing the colors of the paper with globules of water. After rest horizontally in the air for 15 seconds, then align the color of the gauge to get the reading. Note: Please compare the values within one minute, more than one minute the measurement will be inaccurate. [Universal application] Ideal water quality can make life healthier and safer. Test strips suitable for all aspects of life, suitable for drinking water, aquariums, swimming pools and spas, industrial water, ponds, hot springs aquatic products. [Portable and independent packaging] Each bottle of test paper includes 50 test papers, each bottle is divided into 5 small aluminum foil bags, each aluminum foil bag has 10 strips. The separate bag is practical and moisture-proof, ensuring long-term sealed storage. [[Practical and Economical] The packaging size is 9.5 3.5 cm, easy and convenient to bring anywhere you want to test water quality. Additionally, there are 100pcs test strips. So you don't need to spend a fortune to test the waters.