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A colorimeter is a device used in colorimetry. In scientific fields the word generally refers to the device that measures the absorbance of particular wavelengths of light by a specific solution.
Be sure that the distilled or DI water is used in step one of the instructions. Purchased distilled or DI water sometimes has electrolytes added back in. These electrolytes are usually forms of calcium and magnesium. This will cause a false high reading during this test.
"I love Hanna Checkers to check for my Phosphates, Alkalinity and pH in my 90 gallon reef aquarium. I am so thrilled that Hanna actually had the inspiration to make these new Checkers to check my aquarium water quality. They are very affordable and very easy to use. I have told all of my aquarium buddies on Reef Central about these and how great they are. "
- Bartolomeo Rego, FL
"So any of you that think you are fine with your titration test kits...think again buddy! Cheap insurance is to buy a Hanna Checker and some Standard Alk solution to periodically test your alk. "
- Mike Meek, TX