tetra water hardness test|6 in 1 tetra test strips : China Besides the most accurate results, Tetra 6 in 1 EasyStrips uses 3 pads that test for General water Hardness (GH), nitrates, nitrites, alkalinity (KH), and pH levels. This product comes in the following sizes: 4 ct, 25 ct and 100 ct. Tests for .
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