Stable alkalinity is one of the most important parameters in a reef tank, and the HeldeReef KH Test Kit lets you measure it with confidence. It uses a titration method, which is far more precise than colour-matching test strips or drop kits. It works for reef, marine and freshwater aquariums.

Why you’ll like it

•100 tests per kit, so it lasts and costs very little per test.

•Reads directly in dKH. Every 0.1 mL on the syringe equals 1 dKH, so there is no conversion.

•Clear endpoint. The indicator turns to a distinct grey, so results are easy to repeat.

•Cross-checked. We validated the kit against a gravimetric reference standard and a leading commercial KH kit, with readings agreeing closely.

•Wide range. Each syringe fill covers 0–10 dKH. For higher readings, simply refill the syringe and add the volumes together.

How to use it

1.Fill the syringe with a 2 mL tank water sample.

2.Add 2 drops of mixed indicator.

3.Titrate until the sample turns grey, then read the result off the syringe.

Refills

Refill kits (100 tests) are available, so you can keep using your syringe and vials.