EASYTEST 7-Way Pool Test Strips, 150 Strips Water Chemical Testing for Hot tub and Spa, Accurate Test Bromine, Total Alkalinity, pH, Free Chlorine, Total Hardness, Cyanuric Acid, and Total Chlorine

The strips didn't work, kept reading ph wrong. I bought distilled water to double check - consistently read it at a ph of 6. I tried another sample if purified water - did the same again.

Item received on time. Used only once very precise and because of that you can treat your pool accordingly. Product highly recommend.

Very easy to read

Muy prácticas para tener un control rápido y visual del estado del agua de la piscina o spa. Las tiras ofrecen 7 mediciones en un solo test, incluyendo pH, cloro, alcalinidad y dureza. Resultado claro en pocos segundos. Buena cantidad de tiras por el precio. Recomendables para un mantenimiento básico y frecuente.

they seem accurate, but how would you really know?