API Test Tubes

Replacement capped test tubes for API's liquid test kits — the part that gets dropped, chipped or permanently stained long before the reagents run out. Twenty-four in a pack, which is also enough to set up several tests side by side instead of rinsing between each one.

API describes these as fitting all of its liquid test kits, freshwater, saltwater and reef alike. They are not a test in themselves — the reagents and colour cards come with the kits.

Keeping them readable

Rinse with tap water immediately after use rather than at the end of the session, and never with detergent — residue is harmful to fish and will skew the next reading. Tubes that have gone cloudy or permanently tinted should be replaced; a stained tube quietly shifts every colour match you make with it.

Kits these fit: Freshwater Master, Saltwater Master and Reef Master.

API replacement test tubes on the API website