2019/10/09 · The DR1900 will accept the following vial/cell sizes: Most 13mm LCK/COD vials (not all LCK vials are suitable for use in DR1900). Please note, in this instrument the barcode recognition of LCK vials is not possible. 1 inch sample cell (round, square and pour thru) 1 cm sample cell. The DR1900 does not accepts the 16mm TNT/COD vials.