Copper kits are usually of two types: compleximetric or titration based. Some kits measure only ionic copper and others measure both ionic and chelated copper. This kit uses a highly sensitive catalytic compleximetric based procedure to measure all types of copper to less than 0.01 mg/L in marine or freshwater. MultiTest™ Copper performs over 75 tests and contains a reference sample for validation.
MultiTest™: Copper performs over 75 tests
And with the multi-cavity test plate, multiple tests can be run at the same time.
Measures between 0–0.80 mg/L copper
Detectable changes on the color chart in 0.025mg/L & 0.0025 mg/L increments.
It isn't necessary to run a reference test to use this kit; however, its proper performance can be validated by running a test in the normal manner except that the reference sample is used in place of aquarium sample. You might choose to run a reference test if you have cause to believe the test is giving incorrect results.