








🐟 Master your saltwater aquarium with precision and confidence!
The API SALTWATER MASTER TEST KIT offers 550 high-accuracy tests to measure high range pH, ammonia, and nitrate levels in saltwater aquariums. Designed for weekly monitoring and troubleshooting, it includes six testing solutions, a color card, and four capped glass test tubes, helping prevent fish loss by detecting invisible water problems early. Trusted by thousands with a 4.6-star rating, this kit is essential for maintaining a healthy aquatic environment.













| ASIN | B001EUE808 |
| Batteries Included | No |
| Batteries required | No |
| Best Sellers Rank | 7,126 in Pet Supplies ( See Top 100 in Pet Supplies ) 15 in Aquarium Test Kits |
| Customer Reviews | 4.6 4.6 out of 5 stars (8,465) |
| Date First Available | 8 Aug. 2009 |
| Delivery information | We cannot deliver certain products outside mainland UK ( Details ). We will only be able to confirm if this product can be delivered to your chosen address when you enter your delivery address at checkout. |
| Item Weight | 454 g |
| Item model number | 401M |
| Number of Items | 1 |
| Pet Type | Fish |
| Product Dimensions | 17.78 x 14.61 x 12.07 cm; 453.59 g |
| Quantity | 1 |
| Size | One Size |
| Volume | 2 |
R**N
See above
Good product easy to use
J**N
Good test kit, easy to use
Good product
B**R
Easy to Use
When I first got interested in aquaculture I use a very similar product by another well known manufacturer. I found their small kit to be very good and so eventually graduated to their "Master" test kit. I found the results from some of these tests to be very difficult to interpret as the colours produced by the reagents were often too similar to be able to determine an accurate reading and so, when I needed a buy a replacement kit, thought I would try APIs offering. The bottles actually have the number of drops required printed on them so the dosage doesn't have to be looked up in a booklet every time. The bottles are also designed with a unique (at least I've never seen this before) child proof cap where a small locking collar has to be held firm with a thumb before the cap will unscrew. One of the better child-proof designs in that adults can actually open them very easily! Unlike other brands where only a loose fitting test tube cap is provided, the API test tube caps are a secure fit - essential when shaking a corrosive or irritant test solution for up to a minute. Just as important, the test tubes are easy to rinse without leaving the residue on the glass that I have found with other test kits. The tests either provide instant results or after a 5 minute "developing" period. This means that tests are easier and quicker to undertake compared with other manufacturer's kits where the waiting time for tests varies from instant, to 2, 5 or 20 minutes. The resulting colour changes are very easy to compare against the test chart provided. All in all, an easy to use and well designed kit at a competitive price.
R**M
Pleased with purchase.
Find that the phials stain in time, so bought new.
M**S
Very accurate 👌
Great kit very accurate 👌 better than test strips
R**S
Inconsistent results and now plastic tubes. Where have they gone wrong?
Update: Apologies. Took water to local fish trader. The readings were about right Never before have in nearly 30 years keeping fish have I experienced such massive pond water parameter changes in a short period of time and wrongly accused the kit of being faulty. Lesson learnt. Apologies for review below - I was wrong. ———————————- Bought a couple of these over the years, this one must be faulty. Ph and phosphate tests, you can use the same water and time with 2 tests -and you get different results. Have repeated this multiple times and in 80% of tests the results don’t match. Nitrate and ammonia are fine. This is the first set I’ve bought that’s didn’t have gas tubes but plastic. Maybe that’s the issue. Don’t trust these now so won’t be buying again
R**5
Money well spent
My home-made pond is only a couple of months old but I’ve quickly learnt the importance of maintaining a healthy environment for the fish. After a lot of research I purchased this kit because of the reviews and it appeared good value for money (it does about 500 tests, so should last ages). Initially I put off using the kit because I was concerned it would be too complicated and because I feared the results would prove my pond environment was not good. I was pleased to find the kit was really simple and quick to use. The instructions were brief and clear. All the bottles are clearly marked, so errors are unlikely. I purchased a cheap plastic syringe as other reviewers had suggested, which helped and was the only part this kit lacked. My results came back on point and I’m relieved and pleased. Money well spent for peace of mind.
A**B
Brilliant! Don’t bother with anything else!
The perfect water testing kit! I’m a new aquarium owner and was using the dip sticks but found them hard to read and less accurate so found this kit! It is brilliant, the booklet is easy to use and tells you how to ‘fix’ your water too which as a beginner has been a life saver. I did take a photo copy of the colour chart on the leaflet and annotated it with the leaflet info for my personal convenience which is what you can see in the attached. (I still use the actual leaflet to determine the test colours) I would have given 5* but one of my glass test tubes was cracked when it arrived and ended up completely breaking when I got it out of the box which is very annoying but don’t want to return the whole kit as needed to test my water! Overall, I definitely recommend this!
B**A
Value for money.
R**I
Very helpful for reef hobbyist
A**I
Product arrived well before the Estimated time frame, Happy with the product. Good, Fast, Reliable Service.
K**R
Worth the money spent on it.
A**D
A must for aquarium and biofloc maintenance. Please mind that this kit is salt water or high ph kit, hence you will receive only high ph testing reagent. If you require low ph testing reagent, then go for fresh water testing kit. Although high range ph testing provide you with results from 7 and higher ph, which is enough to serve the purpose of aquarium and biofloc (since 7-8 ph is necessary to maintain). Overall good product.
Trustpilot
1 month ago
2 weeks ago