Standard Cell Counter Dilution Vials with Snap-on Lid 30ml (25ml maximum working volume). Vials are graduated at the 10 and 20 ml marks. Available in Bulk Packs and in Segmented Tray Packs. Polystyrene Vial. Polyethylene Snap-on Lid. Square bottom style. For Coulter® Counters, and other counters. Coulter is a registered trademark of Beckman Coulter, Inc.