--- product_id: 1627371 title: "API SALTWATER MASTER TEST KIT 550-Test Saltwater Aquarium Water Test Kit" price: "€ 75.59" currency: EUR in_stock: true reviews_count: 13 url: https://www.desertcart.sk/products/1627371-api-saltwater-master-test-kit-550-test-saltwater-aquarium-water store_origin: SK region: Slovakia --- # 4 vital saltwater parameters monitored 550 precise tests included weekly water health tracking API SALTWATER MASTER TEST KIT 550-Test Saltwater Aquarium Water Test Kit **Price:** € 75.59 **Availability:** ✅ In Stock ## Summary > 🌟 Keep your saltwater sanctuary thriving — test smarter, not harder! ## Quick Answers - **What is this?** API SALTWATER MASTER TEST KIT 550-Test Saltwater Aquarium Water Test Kit - **How much does it cost?** € 75.59 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.sk](https://www.desertcart.sk/products/1627371-api-saltwater-master-test-kit-550-test-saltwater-aquarium-water) ## Best For - Customers looking for quality international products ## Why This Product - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **User-Friendly Design:** Includes color card, 4 capped test tubes, and easy instructions for stress-free testing - • **Proactive Aquarium Health:** Catch invisible water issues before they threaten your marine life - • **Comprehensive 550-Test Kit:** Unmatched testing volume for long-term aquarium care - • **Trusted by Experts & Hobbyists:** Same tests used by local fish stores and professionals for reliable results - • **4 Critical Saltwater Parameters:** Monitor pH, ammonia, nitrite, and nitrate with lab-grade accuracy ## Overview The API SALTWATER MASTER TEST KIT offers 550 tests to accurately measure four essential water parameters—high range pH, ammonia, nitrite, and nitrate—in saltwater aquariums. Designed for weekly monitoring and quick problem detection, it includes six reagent bottles, four capped test tubes, and a color chart for easy, precise testing. Trusted by professionals and hobbyists alike, this kit helps maintain a safe, healthy environment for marine fish and invertebrates, preventing stress and loss caused by invisible water quality issues. ## Description Protect marine fish and invertebrates from unsafe water conditions with API SALTWATER MASTER TEST KIT. Fish waste, uneaten food, plant refuse and other organic compounds can create harmful levels of ammonia, nitrite and nitrate as well as cause drastic fluctuations in pH. These unhealthy conditions can result in fish stress, gill and tissue damage and even death. The API SALTWATER MASTER TEST KIT accurately measures these four saltwater parameters that are key to keeping your aquarium healthy. It includes six bottles of liquid test reagent, four test tubes with snap-tight caps, a holding tray and a step-by-step instruction booklet with information on how to correct unsafe water conditions. Simply fill a clean test tube with 5 ml of water, add the appropriate test drops and compare results with the color chart. Then follow the recommendations to modify conditions if action is needed. With API aquarium products, it’s easy to keep a beautiful saltwater, freshwater or reef aquarium. For almost 60 years API has developed premium solutions with proven and effective results for your family and ours. API offers a range of testing kits, water conditioners, and nutritionally superior food, because we’re dedicated to making a better underwater world. They work to provide a safe, hospitable environment for fish such as tropical community fish, cichlids, goldfish and more. At API, we understand the rewards and relaxation of fishkeeping because we have a passion for fish too. Review: Great product - Greta testing kit. Shows all levels and very accurate. Review: Worked - Worked awesome ## Features - Contains one (1) API SALTWATER MASTER TEST KIT 550-Test Saltwater Aquarium Water Test Kit, including 6 bottles of testing solution, 1 color card and 4 test tubes with cap - Helps prevent invisible water problems that can be harmful to fish and cause fish loss - Accurately monitors 4 most vital water parameters levels in saltwater aquariums: high range pH, ammonia, nitrite and nitrate - Designed for use in saltwater aquariums - Use for weekly monitoring and when water or fish problems appear ## Technical Specifications | Specification | Value | |---------------|-------| | Customer Reviews | 4.6 out of 5 stars 4,667 Reviews | ## Images ![API SALTWATER MASTER TEST KIT 550-Test Saltwater Aquarium Water Test Kit - Image 1](https://m.media-amazon.com/images/I/71A-PyQBvVL.jpg) ![API SALTWATER MASTER TEST KIT 550-Test Saltwater Aquarium Water Test Kit - Image 2](https://m.media-amazon.com/images/I/71YLLo0X1rL.jpg) ![API SALTWATER MASTER TEST KIT 550-Test Saltwater Aquarium Water Test Kit - Image 3](https://m.media-amazon.com/images/I/4120clwvUbL.jpg) ![API SALTWATER MASTER TEST KIT 550-Test Saltwater Aquarium Water Test Kit - Image 4](https://m.media-amazon.com/images/I/71LUDG3W-JL.jpg) ![API SALTWATER MASTER TEST KIT 550-Test Saltwater Aquarium Water Test Kit - Image 5](https://m.media-amazon.com/images/I/81R8k+qKRyL.jpg) ## Available Options This product comes in different **Style** options. ## Questions & Answers **Q: How many tests can be run with this kit?** A: About 120. Problem is that if you use the full set of products daily you will quickly run out of the ammonia test and the Nitrates tests (each with 2 bottles) because they take 8-10 drops each, compared to the Ph test which only takes 3 drops. I mainly test ammonia and nitrites so I've had to buy separate ammonia kits twice now because I ran out of fluid, while my high range ph bottle is nearly full. Also - Prime, AmGuard and other products convert Ammonia into harmless Ammonium however, it will still read as ammonia on your API kit - so it's basically lying to you. There are kits that will show you active ammonia and harmless ammonium and my API kit reads 8.0 ammonia but the other kit reads it as all harmless ammonium and zero active ammonia. You have do dose your tank with Prime every 48 hours or less to keep the ammonium from converting back to killer ammonia. This will keep happening until your tank finally converts the ammonium to nitrites. My 2 of my 4 well-cycled tanks somehow lost their cycling so that's not happening for those tanks yet. **Q: I'm a newbie. I have a betta in 10G tank and I'm told that I need to test the water always.Not sure if I should get this or get cheaper ones instead.** A: Frankly, with a 10G tank you should just be doing weekly water changes of at least 25-30%. You can't really "let things go" with a tank that size and it's unlikely that you would have ammonia spikes with such frequent water changes. I have a little 5.5 gallon with a couple of albino cory cats and I use a test strip every once in a blue moon, but the water is always fine because I do weekly changes. Am looking at this kit for my 125 gallon tank, but would bother for a tiny tank. **Q: Would this kit be a good one for my planted aquarium?** A: Yes, this is a good general water testing kit, unless you have plants that are very sensitive to water hardness. This kit does NOT include a water-hardness tester. **Q: Can any of these tests be used for both saltwater and freshwater? I noticed a lot of the individually packaged tests say they can be used for both.** A: Api ammonia, nitrite and nitrate test kits can be used for both salt and fresh water aquariums, the liquid solutions are the same for salt and fresh. BUT the color cards that you use to compare your test to are slightly different. I have both fresh water and marine. The first time I bought these kits, I bought for saltwater and freshwater and never threw away the color cards. Now it doesn't matter if I get freshwater or saltwater test kits because I have both freshwater and saltwater cards. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Great product *by M***J on March 31, 2026* Greta testing kit. Shows all levels and very accurate. ### ⭐⭐⭐⭐⭐ Worked *by A***D on March 24, 2026* Worked awesome ### ⭐⭐⭐⭐⭐ Relief to Use *by B***E on October 20, 2024* These are relatively easy to use and accurate. They are the same tests my LFS uses and my tank maintenance person uses. It is a great value for the money and a good accurate test kit for the average aquarium owner. My LFS still does testing once a month to ensure accuracy but this helps to catch anything going south with the tank in between maintenance visits. ## Frequently Bought Together - API SALTWATER MASTER TEST KIT 550-Test Saltwater Aquarium Water Test Kit - Instant Ocean Sea Salt 50 Gallons, For Marine Aquariums, Fast Dissolving --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.sk/products/1627371-api-saltwater-master-test-kit-550-test-saltwater-aquarium-water](https://www.desertcart.sk/products/1627371-api-saltwater-master-test-kit-550-test-saltwater-aquarium-water) --- *Product available on Desertcart Slovakia* *Store origin: SK* *Last updated: 2026-05-27*