The Planted Tank Forum - View Single Post - reliable brand of PH and TDS meters?
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Old 06-09-2013, 11:37 PM   #10
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is this a good one and will the 1382 ppm solution be what I need for recalibration. Sorry I'm not familiar with these TDS meters. I know you can get other ppm solutions.

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what?! link removed??? ok.... it's a HM TDS4 meter with 1382 solution for $21
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