Fine. It's not that accurate and I've never been able to calibrate it for 4.01 packs even after I bought more thinking I'd screwed it up. But I need absolutely accurate results as this is for an aquarium. The test strips and liquid tests I already have are more accurate. I wanted something I could get a quick answer from. So 7.5 is on the meter like 8.2, which can mean death if the tank is set incorrectly.
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