Hanna Instruments Replacement Cuvette Caps for Checker HC Colorimeters (Pack of 4) (HI731225)

Hanna Instruments Replacement Cuvette Caps for Checker HC Colorimeters (Pack of 4)

The HI731225 is a set of four genuine replacement black caps designed to screw onto the glass cuvettes used with Hanna Instruments Checker HC (HI7XX series) handheld colorimeters. Keeping spare caps on hand ensures uninterrupted pool and water testing when existing caps become lost, cracked, stained, or worn. The caps also serve the important function of blocking ambient light from entering the cuvette holder during optically based measurements.

Compatibility

These caps are designed specifically for use with the HI731321 16 mm glass cuvettes (sold separately) and are compatible with the full range of HI7XX Checker HC colorimeters. They are not intended for use with cuvettes from other Hanna photometer or turbidity meter series, which use different cap variants.

Why genuine matters

Checker HC colorimeters rely on precise optical paths to deliver accurate readings. A genuine Hanna Instruments cap ensures a correct, light-tight fit on the HI731321 glass cuvette, preventing stray light from interfering with measurements. Off-brand or ill-fitting caps risk compromising reading accuracy — a critical concern when testing pool water chemistry for health and safety.

Installation

Simply screw the cap firmly onto the filled HI731321 glass cuvette before inserting it into the Checker HC colorimeter. Ensure the outside of the cuvette is clean, dry, and free from fingerprints or oils prior to insertion. With four caps included in each pack, users can maintain multiple cuvettes ready for back-to-back tests.