What is the difference between M8 and M9 papers and their uses during an inspection?

• A. M8 paper is a colorimetric detector used on surfaces to indicate the presence of chemical agents; M9 paper is a field indicator used to detect liquid chemical agents on terrain, equipment, and clothing.
• B. M8 paper detects liquids; M9 detects surfaces.
• C. M8 is a protective garment; M9 is a mask.
• D. M8 and M9 are types of PPE.

Answer: (A)

The difference centers on where and how each detector is used in the field. M8 paper is a colorimetric detector applied to a surface to show if chemical agents are present on that surface—the readout happens directly on the tested surface, giving a quick indication of contamination on walls, equipment, or other items you can wipe or press the paper against. M9 paper, by contrast, is a field indicator used to detect liquid chemical agents in the environment itself—on terrain, on gear, and on clothing—so it’s used for broader, on-the-move screening of potential liquid contamination.

So, use M8 for testing a specific surface you’re inspecting, and use M9 for quick checks of liquids on field items or ground around you. The other options mix up these roles or describe PPE, which isn’t accurate for these detectors.