Easy to use, just dip the strip in water and read, just poor accuracy and color blocks mix so difficult to read. My nitrates/nitrates are not showing at all. I've died a few fish and took professional reading water, nitrates to the sky, came home, retested with those straps and got zero again for those ranges. It's too late to return the item for me so I'll stick with them. Save your money and don't buy it.
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