I've used plenty of test kits over the years and always question their accuracy as well. I started using the Seachem test kits recently and the ones I've used come with a reference value. It make it a little easier to guage the colour especially if you put the reference value beside the tank sample.
Overall, test kits are a pain in the #@%!! A necessary evil.
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New!! 150 gal. wt 2 x 250W 10000K MH & 4 T5 Actinics.
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