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🐠 Keep your aquarium’s vibe flawless — test smarter, fish happier!
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 for weekly use, it helps aquarists maintain mineral levels that replicate natural fish habitats, preventing stress and sudden pH shifts. With two test bottles, capped tubes, and clear instructions, this kit offers trusted, precise monitoring backed by nearly six decades of API’s aquatic care expertise.


















| ASIN | B003SNCHMA |
| ASIN | B003SNCHMA |
| Best Sellers Rank | #3,100 in Pet Supplies ( See Top 100 in Pet Supplies ) #3 in Aquarium Test Kits |
| Brand Name | API |
| Color | DAA |
| Customer Reviews | 4.7 4.7 out of 5 stars (5,862) |
| 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 x 2.83 x 1.73 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 |
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