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API aquarium test kits are an amazing buy for the money.  Fairly accurate and cheap are things not often found in the hobby. 

When testing your reef tank for Magnesium (Mg) and Phosphate (PO4) you will want to look at the RedSea, NYOS, or Salifert Test kits as they are far more accurate.  API test kits are a great starter test kit but should not be used when more accurate readings are needed.

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