Water test kit sera 04210 — carbonate hardness (KH) measurement, 0.015 L, hanging box

sera 04210 is a compact water test kit for measuring carbonate hardness (KH) in aquarium and pond water. Supplied in a hanging box with reagents for testing 0.015 L samples, the kit enables spot checks of buffering capacity to help manage stable water chemistry for aquatic plants and animals. The test range covers approximately 390 °dKH, allowing users to detect whether KH is within an acceptable range for their system.

Advantages

The kit provides a simple titration-style procedure that requires only small sample volumes and minimal equipment. Packaged for convenient storage or display, it is suitable for hobbyists and pond keepers who need occasional KH measurements. Included reagents are formulated to give reproducible results when instructions are followed, supporting decisions about water treatment such as KH/pH adjustments or peat filtration.

Suitable for

• Freshwater aquariums where carbonate hardness influences pH stability and plant growth
• Ponds requiring periodic monitoring of buffering capacity
• Saltwater systems for spot-checking KH levels alongside other water parameters

Key specifications

• Parameter measured: carbonate hardness (KH)
• Sample volume per test: 0.015 L
• Packaging: hanging box for retail display and storage
• Type of method: reagent-based titration test
• Intended use: aquarium and pond water monitoring
• Approximate measurement coverage: up to ~390 °dKH

How to use

Collect a 0.015 L water sample in a clean test vial and follow the included instructions to add reagents sequentially while observing the colour change. Titrate carefully until the specified endpoint colour is reached, counting the number of drops or additions as indicated to determine the carbonate hardness value. Rinse and dry test vessels after use and store reagents in a cool, dry place away from direct sunlight.

Usage recommendations

For low KH values in freshwater, consider using a KH/pH-plus product; for ponds, a balanced bio additive can help. If KH is too high in freshwater aquaria, filtering through peat can reduce carbonate hardness. Perform tests regularly and record results to track trends and guide corrective actions.