Colorimeters

Hanna Instruments Hanna Instruments HI774-25 Phosphate Checker Review: Accurate Low Range Testing? The Hanna Instruments HI774-25 provides a highly accurate and easy-to-use solution for measuring low range phosphate, making it ideal for reef tank keepers and others needing precise water chemistry control. While reagent costs add up, the accuracy justifies the investment for sensitive applications. Sep 15, 2026→ Hanna Instruments Hanna Instruments HI701 Checker HC Handheld Colorimeter for Free Chlorine Review The Hanna Instruments HI701 Checker HC is a highly recommended handheld colorimeter for precise free chlorine measurement, offering a superior balance of accuracy, ease of use, and portability. Sep 13, 2026→