







🐠 Keep your tank thriving—test smarter, not harder!
The API GH & KH Test Kit is a compact, easy-to-use freshwater aquarium water testing solution that accurately measures general and carbonate hardness. Designed to help aquarists maintain optimal water conditions, it prevents stress-inducing pH fluctuations and supports healthy fish and plant life. With two bottles of testing solution and reusable test tubes, this kit offers reliable, cost-effective monitoring trusted by hobbyists and professionals alike.









| ASIN | B003SNCHMA |
| ASIN | B003SNCHMA |
| Best Sellers Rank | #2,059 in Pet Supplies ( See Top 100 in Pet Supplies ) #3 in Aquarium Test Kits |
| Brand Name | API |
| Color | DAA |
| Customer Reviews | 4.6 4.6 out of 5 stars (5,714) |
| Date First Available | June 20, 2004 |
| Date First Available | June 20, 2004 |
| Department | Unisex-Adult |
| Department | Unisex-Adult |
| Directions | It is necessary to test the GH and KH to monitor water quality and prevent stressful conditions. |
| Is Discontinued By Manufacturer | No |
| Item Dimensions LxWxH | 2.75 x 1.63 x 5.13 inches |
| Item Package Dimensions L x W x H | 5.08 x 2.76 x 1.77 inches |
| Item Weight | 2.5 Ounces |
| Item model number | 58 |
| Item model number | 58 |
| Manufacturer | Mars Fishcare |
| Manufacturer | Mars Fishcare |
| Material | Plastic |
| Model Name | GENERAL/CARBONATE HARDNESS KIT |
| Number of Items | 2 |
| Product Dimensions | 2.75 x 1.63 x 5.13 inches; 2.5 ounces |
| Size | 2.5 oz |
| Style | GH & KH |
| Target Audience Keyword | Fish |
R**O
helpful tool for maintaining a healthy tank environment
I recently started using the API GH & KH Test Kit for my freshwater aquarium, and I must say it has been an incredibly helpful tool for maintaining a healthy tank environment. Here’s a detailed review based on my experience: **Ease of Use:** The test kit is very straightforward and user-friendly. The included instructions are clear and easy to follow, even for beginners. Testing both General Hardness (GH) and Carbonate Hardness (KH) takes just a few minutes, and the color changes in the water make it easy to get accurate results. **Accuracy:** The API test kit provides reliable and consistent readings. I compared the results with a digital meter, and they matched up perfectly. Knowing the GH and KH levels helps me adjust my water chemistry for optimal conditions, especially for sensitive fish like cichlids and shrimp. **Functionality:** Having a tool that measures both GH and KH in one kit is incredibly convenient. GH helps monitor essential minerals for fish health, while KH is crucial for stabilizing pH levels. This kit makes it easy to detect changes early, helping prevent pH swings or stress in my fish. **Value for Money:** For the price, you get a high-quality, reliable kit that will last quite a while. The included bottles have enough solution for numerous tests, making it a cost-effective option for regular water monitoring. **Overall Impressions:** The **API GH & KH Test Kit** is a must-have for any freshwater aquarium enthusiast. It’s easy to use, highly accurate, and helps ensure your water parameters are within the right range for your fish and plants to thrive. I highly recommend it for hobbyists of all experience levels. **Rating: 5/5** Reliable, accurate, and easy-to-use water testing for a healthy aquarium!
C**S
👍
Works well very helpful
H**R
Worth the money if you have shrimp and need to understand the causes of a high water PH
I have shrimp, so this was important to have when understanding my water parameters. Its easy enough to figure out the tests as per the instructions, but the results are sometimes difficult to interpret. The look of the test color is sometimes unclear, but thats when I add another drop of the test liquid to make sure I know for sure what color Im seeing. Its important to not touch the chemicals to your skin. The bottles are a decent size and will last me a good amount of time. Worth the money if you have a species thats sensitive to hard water or if you're trying to determine the cause of a high PH.
M**Z
Slightly tricky if not annoying ,on first use.
Well it finally arrived,a bit diferent to use than my other full API freshwater kit. The one drop and shake and so on to get the GH and KH results is slightly tricky if not annoying at first compared to the simple direct drop counting and instant results of the full kit. In they end, quite pleased once you get the hang of it and get the needed results.
V**V
I’m good
Pretty good testing kit I’ll give my pros and cons for the pros. This test kit is really good for trying to calculate your GHAKH if you’re keeping pets that need it personally for me it took a couple days to actually get a good reading of GHNK because it doesn’t have a color chart another pro is that they give you a number chart of how many drops in degrees your education should be a pretty good product. You’ll understand it after for the cons is that it’s really confusing at first. I want to say it’s the best beginner products unless you really know about your water chemistry but for anything else is pretty good
S**.
Nothing Fishy!
A little water chemistry to help me get perfect espresso brewing water. Easy to use and understand.
D**E
Understanding hardness
I found the test strips difficult to read so I am happy I got this test set. Very simple and straightforward instructions.
K**L
Works as Expected
Very easy test and important. Comes with test tube.
K**S
This is an essential test kit for fish keeping as it will determined the general hardness and carbonate hardness in the water. I use ro water for my fresh water tanks which gives the pure form of water. Then I mix general hardness enhancing solution like seachem equilibrium or seachem replenish to make water with desired gh level. Then I use seachem alkaline buffer and acid buffer accordingly to maintain the proper carbonate hardness and ph for the specific species tank I'm using the water. This kit comes handy in checking the final gh and kh levels before adding the water in the tanks..
T**R
easy to use and accurate. good to monitor hardness in fresh water aquarium
B**P
Easy to use and readings of both gh and kh very accurate no guessing or matching colours
D**H
Muy bien producto a precio racionable, dar bien mediciones comprobado contra otras test kits mucho mas caro y todos muestra la misma nivel de GH y KH. Muy facil de usar aunque con agua muy blanda como el mio hay que mirar desde arriba contra algo blanco para ver el color de inicio en test GH.
S**H
genuine product and works as expected. my last GH kit (same brand) died after 2 years so the GH reagent does expire. Kh from the same box is going strong. I'm getting more use out of the GH and more sensitive readings by a reverse titration. one drop of reagent in a test tube, then drip water using a syringe into the test tube until it turns orange. GH= 5ml/(dripped water (ml)) . works very well for high gh 6-12 but requires a little math and becomes less sensitive at very high gh.
Trustpilot
2 months ago
4 days ago