API Reef Master Test Kit
An accurate and economical liquid test kit. Tests for 4 key parameters in reef aquariums: Calcium Carbonate Hardness (KH), Phosphate and Nitrate.
Key Features
- Tests for Calcium Carbonate Hardness (KH), Phosphate, and Nitrate
- Includes laminated computer-calibrated colour card
- 4 glass test tubes with snap-tight caps
- Easy-to-read instructions with guidance on correcting unsafe water conditions
- Child-resistant safety caps on liquid reagent bottles
- Unique clear dome packaging is waterproof, space-efficient, and allows easy visibility of contents
| Parameter Tested | Test Method |
|---|---|
| Calcium Carbonate Hardness (KH) | Colorimetric comparison using calibrated card |
| Phosphate | Colorimetric comparison using calibrated card |
| Nitrate | Colorimetric comparison using calibrated card |
FAQ
How often should I use this test kit?
It is recommended to test water parameters weekly for stable reef aquariums, or more frequently during water changes or after introducing new livestock.
Can this kit measure pH levels?
No, this kit does not measure pH. It tests for Calcium Carbonate Hardness (KH), Phosphate, and Nitrate only.
Are the test results accurate?
Yes, the test kit uses computer-calibrated colour cards for consistent and accurate results.

Justin Churchill –
The test kit is easy to use and provides clear results. I’ve been using it for three months and it helps me maintain stable water conditions in my reef tank. The clear dome packaging makes it simple to see the test solution without opening the bottle.
Dylan Mackenzie –
Good value for the parameters tested. The instructions are straightforward and the colour card is reliable. I noticed a small variation in phosphate readings, but overall it’s consistent with my other test methods.
Liam Paige –
I appreciate the child-resistant caps and the waterproof packaging. It’s a reliable kit for daily monitoring. The test tubes are easy to handle and the results match what my aquarium monitor shows.