A cuvette is a small, reusable sample container used in spectrophotometry and other optical analysis techniques to hold liquid samples for measurements of light absorption, transmission, and fluorescence. 

* Material: Made by glass material, stable material, uniform wall thickness, no lines and bubbles, acid and alkali resistance. 

* Versatility: Compatible with most UV and visible spectroscopic assays, this cuvette works seamlessly with various spectrophotometers and photometers. 

* Polished Sides: Cuvettes have two or four polished sides. The two polished sides are for absorption measurements, while four polished sides are necessary for fluorescence and scattering experiments where light is collected at 90° to the incident beam.