Alkalinity Test Kit

Fast, repeatable alkalinity testing for saltwater and reef aquariums. The Benchmark Alkalinity Test Kit measures from 0–20 dKH using a clear blue-to-red endpoint and an easy calculation.

Video tutorial

What’s included

• 118 mL Alkalinity Titrant
• 7.5 mL Alkalinity Indicator
• 10 mL sample vial
• 5 mL sample syringe
• 1 mL titration syringe
• Reusable testing stand with quick-read instructions

How to test

1. Add 5.00 mL of aquarium water to the sample vial.
2. Add 2 drops of Alkalinity Indicator and swirl. The sample turns blue.
3. Fill the titration syringe to 1.00 mL with Alkalinity Titrant.
4. Add titrant slowly while swirling until the sample changes to red.
5. Record the amount used and calculate dKH = mL titrant used × 10.

Provides approximately 100 tests at typical reef-aquarium alkalinity levels.

Already have the tools? The Alkalinity Refill Reagents are the best-value way to replace both reagents. You can also replace only the Indicator or Titrant.

For aquarium testing only. Keep out of reach of children and read all product labels and safety information before use.