2-Pack AquaChek Total Hardness Test Strips for Pool &amp; Spa Water - 2 x 25 ct. bottles (50 tests total)<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Total Water Hardness - Spa， Pool， or household water testing</li><li>Calcium + Magnesium Levels</li><li>Low Range (up to 120ppm)</li><li>High Range (from 250 to 1，000ppm)</li><li>Two 25-count bottles (50 tests total)</li></ul></div><img src="http://ecx.images-amazon.com/images/I/51xyfnBE6uL.jpg" noproxy>