I have the hanma one with ppb love it seems to get fairly constituent reading but mostly I use it to test before after after GFO so I know when to replace it test before WC and once a week I can see p04 rising and sometime I need to change out gfo between WC others not. Honestly I couldn't handle trying to read what color off hue blue was which so opted for it
Just my 2 cents
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Current tank---125 gallon mixed reef 60 gallon sump, Reef octopus nw200 skimmer, Rapid LEDs, Maxspec gyre, Mp10s, Fuge, Biweekly 20% WC, QT everything
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