According to Pro Tool Reviews, the Inkzall marker by Milwaukee Tools has the “uncanny ability to write through dusty, wet, or oily surfaces.”
The marker can strike a line through ½-inch of sawdust or drywall dust. “Using the marker, I wondered how on earth the technology was even possible,” reviewer Clint DeBoer writes. “As it turns out, the ink is the secret as well as how the tip is made—specifically in its ability to retain its usefulness over rough surfaces that would tear a tradition felt tip to shreds.”
Read the full review at Pro Tool Reviews.