Hach spectrophotometers, chemistries, and methods are designed, developed, and manufactured to optimize your results. Specifications Footnote: Can be used with DR 5000 UV-Vis, DR3900, DR 3800, DR 2800, DR 2700 or DR1900 Spectrophotometers. Material: Glass Optical Path Length: 1 inch square Quantity: 2 pcs 10 mL, matched pair