Use Thermo Scientific™ Orion™ AQUAfast 24mm round vials with a variety of Orion™ colorimeters and spectrophotometers. The Orion™ AQUAfast 24mm round vials can be used with Orion™ AQUAfast colorimetric powder pack, tablet and liquid reagents to measure a variety of common water and wastewater parameters. Catalog number AC2V24 contains 12 x 24mm vials.