Collection: Hanna Checkers

A colour card asks you to judge a shade against a printed chart. A Hanna Checker reads the sample and returns a number — repeatable, and the same whoever runs the test.

Stocked here: Checkers for alkalinity (dKH), calcium, magnesium, nitrate, phosphate low range, phosphorus low range and copper high range, alongside marine pH and salinity testers and handheld pH/conductivity/TDS meters. Reagent packs and calibration solutions are sold separately, and each Checker takes its own — worth ordering together. Questions? Email info@jlaquatics.com.