The new EcoTech Marine Radion XR15w...
The Salifert Copper Testing Kit is of most importance when treating the aquatium or hospital tank.
The number one way to test for phosphate.
Best bang for your buck, pH test.
Salifert Ammonia Test Kit
Nitrite is a critical part in the nitrogen cycle and must be tested with the Salifert Nitrite Test Kit.
If you own a reef tank, than the "Big 3" combo testing kit by Salifert is mandatory; the number one item you need to accurately test your aquarium parameters. The kit comes with a testing combo kit for calcium, alkalinity and magnesium.
It is a must to test for nitrate in the Aquarium. High nitrates cause algae blooms and in very high amounts it becomes toxic.
Magnesium is one of the big three when it comes to aquarium chemisty, test with the Salifert Magnesium Test Kit for accurate measurements.
Saliferts' Calcium Test Kits are one if not the best Calcium test kits avalible globaly for the testing of marine calcium.
Alkalinity is the most important factor in a reef tank. It should be test daily and the alkalinity value kept constant.