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Articles written in English, mainly on Japanese precision measuring tools and manufacturing practice.

: Dial Indicator or Dial Test Indicator? Cosine Error, Measuring Force, and the Stand You Are Blaming the Wrong Part For

2026/9/9

Plunger indicators and lever-type test indicators are different instruments for different jobs, and both are routinely used at angles that quietly shrink the reading. A manufacturing engineer in Japan covers cosine error with the actual numbers, the direction-reversal mistake that destroys test indicators, and why the stand is usually the real error source.

: Mitutoyo Micrometer Model Numbers: How to Read Them and Pick the Right One

2026/9/9

Mitutoyo catalog numbers like 293-330-30 look arbitrary, but the first three digits tell you almost everything. A manufacturing engineer in Japan explains how to read them, why the thimble type matters more than most buyers expect, and what the included inspection certificate does not give you.