Hanna Glass Cuvettes and Caps for Checker® HC Colorimeters (set of 2)If you have lost or broken the included cuvettes and caps that were included with your Hanna Checker or simply just want an extra set on hand, we carry replacements directly from Hanna. Over time the glass vials can become stained and discolored which can lead to inaccurate readings. We suggest replacing the cuvettes and caps once every year for dependable readings. What's Included? 2x Hanna Glass Cuvettes 2x Hanna Cuvette Caps