Amazon.com : Tetra EasyStrips 6-In-1 aquarium
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. These Tetra EasyStrips are available in 25-strip count and 100-strip count packages.
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