Fangrui Product Details 1. Features: 2. **comprehensive Testing**: Our Pool Test Strips Provide Accurate Readings For Free Chlorine, Bromine, Ph, Total Alkalinity, And Hardness, Ensuring Your Pool Water Is Safe And Balanced For Swimming. 3. **easy To Use**: Simply Submerge The Strip In Water For 5 Seconds, Hold It In The Air For 10 Seconds, And Compare The Results To The Color Chart On The Bottle For Quick And Reliable Results. 4. **fast Results**: Get Instant Feedback On Your Pool Water Quality, Allowing You To Make Necessary Adjustments Quickly And Efficiently, So You Can Enjoy Your Pool Without Worry. 5. **50 Strips Included**: Each Pack Contains 50 Test Strips, Providing You With Ample Supply For Regular Testing, Ensuring Your Pool Remains In Optimal Condition All Season Long. 6. **family-friendly**: Keep Your Family Safe While Swimming By Regularly Testing Your Pool Water, Giving You Peace Of Mind And A More Enjoyable Swimming Experience. 7. Our Test Strips Contains Paper. It Can Quickly Detect The Approximate Range Of Free Chlorine, Bromine, Ph And Total Alkalinity In Water. Its Application Method Is Very Simple: Submerge The Pool Test Strip Under Water For 5s. Hold It Still In The Air For About 10s. Compare Pool Test Strip To Color Chart On Bottle. Test The Water Quality So That You And Your Family Can Swim More At Ease.