JBL Proaquatest Cu Test Kit

Recommended level for oodinium treatment: 0.3 milligrams/litre Cu. Accurate test for determining the copper content in freshwater and saltwater tanks.
Can also be used to check tap water, which should not contain any copper.
Helpful in administering medications and preparations containing copper, as the copper content should never exceed 0.3 milligrams/litre, whilst insufficient doses will not result in a cure.