GSG Depth Micrometer Chek Master
GSG DM-1 (English & Metric Models Available)

Manufactured in both Metric & Standard models.
The GSG DM-1E & DM-1M is for calibrating depth mic's from .500 to 5.500" ±.0002 in 1.00" steps and from 12.5mm to 137.50mm ±.005mm in 25mm steps

For more info on the GSG DM-1

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