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I find the API GH test kit is not very good. It has a very limited shelf life, and even when it is still working the color changes are hard to see - the colors are very light. I now have the Nutrifin GH test kit, from Amazon, and it works much better.
 

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I find the API GH test kit is not very good. It has a very limited shelf life, and even when it is still working the color changes are hard to see - the colors are very light. I now have the Nutrifin GH test kit, from Amazon, and it works much better.
OP, I needed one too so I took Hoppy's recommendation.

I had to pay around $27 just now on Amazon, but this is peace of mind.. priceless.
 
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