| 399 | Flame Photometry, Potassium | Potassium Test System. |
| 399 | Flame Photometry, Potassium | Potassium Test System. |
| K895718 | LITHIUM CONCENTRATE FOR A FLAME PHOTOMETER | DATA MEDICAL ASSOCIATES, INC. |
| K862300 | AMRESCO FLOW PAC SODIUM POTASSIUM REAGENT | AMRESCO, INC. |
| K831300 | MSI-NAK-50 TEST KIT | MEDICAL SPECIALTIES, INC. |
| K810253 | SODIUM & POTASSIUM TEST KIT | MALLINCKRODT CRITICAL CARE |