Adafruit Messograf Pen Calipers
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Caliper rule? Tire tread gauge? Ruler? Thread scale? Writing instrument? The Messograf is all of these in one.
It is a multipurpose instrument, constructed of chromium-plated brass for those who demand more than just the joy of writing.
Many have tried to copy it - none have succeeded. This is the original.
This retractable ballpoint pen has a large ink cartridge. Made in Germany.