The Milwaukee MI0001 are replacement glass cuvettes for Milwaukee photometers. Set of two per box. The Milwaukee MI0011 are replacement glass cuvettes for Milwaukee turbidity photometer MI415. The Milwaukee MI0002 are plastic replacement caps for the MI0001 cuvettes for Milwaukee photometers. The Milwaukee MI0012 are Plastic replacement caps for the MI0011 cuvettes for Milwaukee turbidity meter MI415. The Milwaukee MI0003 are plastic replacement stoppers for the MI0001 glass cuvettes for Milwaukee photometers. The Milwaukee MI0013 are plastic replacement stoppers for the MI0011 glass cuvettes for Milwaukee MI415 turbidity meters.