50pcs 4-in-1 PH Test Strips Water Quality Test Paper Strip Residual Chlorine Alkalinity Hardness Tester For Swimming Pool

50pcs 4-in-1 PH Test Strips Water Quality Test Paper Strip Residual Chlorine Alkalinity Hardness Tester For Swimming Pool Function: Cost-effective, a box of 50 test rods can test multiple data simultaneously. High-grade plastic bottle packaging, waterproof and moisture-proof. For water quality testing in swimming pools or hot springs. Easy to operate, easy to carry. Description: 1. Immerse the test strip in water for 2s. 2. Stay in the air for about 15 seconds. 3. Compare the test strip with the color chart bottle.