HI93732-01 Dissolved Oxygen – Reagents – 100 Tests

The HI 771 Checker®HC is a simple, accurate, and cost effective way to measure ultra-high ranges of chlorine. Designed as a more accurate alternative to chemical test kits, the HI 771 provides quick, accurate results in four easy steps.

Range 0 - 150 ppm | ferrous sulfate method | Resolution 1ppm