LaMotte Free Chlorine/Bromine/Alk/pH Combo 3-Test Disk - Pack of 50 tube-thickness_.145" The anchors are drilled 1/4

The anchors are drilled 1/4 inch

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LaMotte Free Chlorine/Bromine/Alk/pH Combo 3-Test Disk - Pack of 50 tube-thickness_.145" The anchors are drilled 1/4The LaMotte 4335 H Free Chlorine Bromine Alkalinity pH Combination 3 Test Spin Disk tests for these four elements and can test up to 3 times on the disk. Each disk is divided internally into thirds and each section holds reagents for a separate test. You'll be able to test (for example, FCl, TCl, and pH) three separate times on the same disk, giving you 150 tests per 50 disks. Each disk includes a set of reagents for the series. Tests for all factors