API Saltwater Master Test Kit
The API® SALTWATER MASTER TEST KIT measures the 4 most important saltwater parameters – pH, ammonia, nitrite, and nitrate – to enable easy testing of your tank’s natural cycle, and to aid in maintaining a thriving saltwater aquarium. Testing is fast, easy, and accurate, yielding precise results, and comes with 4 glass test tubes with snap-tight caps and a convenient holding tub for easy storage. This kit also includes a complete, step-by-step instructional booklet with a color chart that provides information on how to correct unsafe water conditions. Each SALTWATER MASTER TEST KIT will conduct 550+ tests, so you can get the most out of your kit for years of fast, accurate water testing.
We recommend that you take a few minutes each week to monitor your aquarium conditions and create a stable environment for your marine life.
| Parameter | Test Included |
|---|---|
| pH | Yes |
| Ammonia | Yes |
| Nitrite | Yes |
| Nitrate | Yes |
| Test Tubes | 4 glass tubes with snap-tight caps |
| Instructional Booklet | Yes, with color chart |
| Test Capacity | 550+ tests |
FAQ
How often should I test my saltwater aquarium using this kit?
We recommend testing your aquarium conditions at least once a week to monitor water parameters and maintain a stable environment for your marine life.
Can this kit be used for both freshwater and saltwater aquariums?
This kit is specifically designed for saltwater aquariums and measures saltwater parameters such as pH, ammonia, nitrite, and nitrate.
Is the test accuracy reliable for detecting small changes in water chemistry?
Yes, the kit provides fast, easy, and accurate results, making it suitable for detecting small changes in water chemistry over time.


Nathan Mackay –
I’ve used this kit for over a year now and it’s been very reliable. The test tubes are easy to use and the color chart in the booklet makes it simple to interpret results. I test my tank weekly and it helps me catch imbalances early.
Amelia Oliver –
The instructions are clear and the test process takes only a few minutes. I appreciate the holding tub – it keeps everything organized. The only thing is the color chart can be a bit hard to read in low light, but overall it’s a solid kit.
Carl Vaughan –
This kit has made maintaining my reef tank much easier. I can now quickly check pH, ammonia, nitrite, and nitrate levels without needing specialized equipment. The booklet is very helpful and the test capacity is impressive.