| M-1 Embedding Matrix | 00673693218511 | Class A | |
| Mark-It™ Tissue Marking Dye Black | 00673693181921 | Class A | |
| Mark-It™ Tissue Marking Dye Blue | 00673693181891 | Class A | |
| Mark-It™ Tissue Marking Dye Green | 00673693181945 | Class A | |
| Mark-It™ Tissue Marking Dye Kit | 00673693181846 | Class A | |
| Mark-It™ Tissue Marking Dye Orange | 00673693181907 | Class A | |
| Mark-It™ Tissue Marking Dye Red | 00673693181914 | Class A | |
| Mark-It™ Tissue Marking Dye Yellow | 00673693181938 | Class A | |
| Masson Trichrome Stain Kit | 00673693169028 | Class A | |
| May-Grünwald Stain | 00673693090445 | Class A | |
| MB22 Premier Microtome Blade | 00673693221665 | Class A | |
| MB35 Premier Microtome Blade | 00673693221672 | Class A | |
| Methenamine-Borax Capsules | 00673693089708 | Class A | |
| Methyl Alcohol | 00673693101516 | Class A | |
| Methyl Alcohol High Purity | 00673693101479 | Class A | |
| Methyl Alcohol High Purity | 00673693101486 | Class A | |
| Methyl Green-Pyronin Y Stain Solution | 00673693089210 | Class A | |
| Microtome Knife | 00673693063500 | Class A | |
| Modified EA | 00673693088404 | Class A | |
| Modified Grocott’s Methenamine Silver Stain Kit | 00673693089180 | Class A | |
| Modified Grocott’s Methenamine Silver Stain Kit (Chromic Acid) | 00673693201957 | Class A | |
| Modified Harris Hematoxylin | 00673693088039 | Class A | |
| Modified Harris Hematoxylin | 00673693088046 | Class A | |
| Modified Mayer's Hematoxylin | 00673693088060 | Class A | |
| Modified Mayer's Hematoxylin | 00673693089364 | Class A | |
UDI Compass