Copper High Range Checker - Colorimeter - Hanna Instruments

The HI702 Copper High Range Checker from Hanna Instruments is a dedicated handheld colorimeter built to take the guesswork out of copper testing. Rather than relying on the subjective process of matching a sample to a printed color chart, the HI702 reads the sample optically and outputs a direct numeric result. This difference matters most when copper levels are being managed closely during fish treatment or tank conditioning, where small errors can have real consequences.

Operation is intentionally simple. A single button guides the user through the measurement sequence, making the process fast and repeatable regardless of experience level. The compact form factor keeps it practical for use at the tank or in the field, and compatibility with both fresh and saltwater broadens its application beyond the reef hobby alone.

Dedicated single-parameter instruments like the HI702 offer a meaningful accuracy advantage over multi-test chemical kits. Because the optical system and reagents are calibrated specifically for copper at high ranges, results are more consistent and less prone to interference from ambient lighting or user interpretation. This makes it a reliable reference point when dialing in treatment dosing.

For setup, replacement reagent sachets for the HI702 are sold separately and should be confirmed in stock before purchase. The unit requires a standard battery (included) and is ready to use out of the box. It is appropriate for hobbyists, aquaculture operations, and education settings where dependable copper readings are a routine need.