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  • Works well
    Verified Purchase

    easy to use, test/retest reliability good, differentiates rain water / tap water

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  • simple but it works.
    Verified Purchase

    tested this and hardness was accurate for my area. I also tested a friend's salt water tank. that changed the reading and it never recovered to the correct reading for my local area. slightly off. I'lll have to see if the salt damaged the probes somewhat.

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