The Colombo Marine Test Lab includes tests for KH, Ca, Mg, NO3 and PO4.
 
Tests are easy to use and the kit includes full instructions for each test. The kit contains enough for 40 tests of each chemical.
 
Giving precise and reliable results, this kit gives accurate results so that you can treat accordingly and maintain your water at its optimal levels. 
 
Tests for: Potassium, Calcium, Magnesium, Nitrate and Phosphate. 
 
Colombo have produced test kits that are developed especially for
seawater. These tests give the best results!