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Manufacturer legacy M-221–M-226 description: micrometer screw, non-rotating tip, servo motor, gearhead and motor-shaft feedback encoder. Technical-data table separates design resolution, minimum incremental motion, repeatability and backlash. The body's0.50mm/100/500 calculation is explicitly original ideal geometry, not a product specification or recommendation.

Part2 of Metrology for Precision Motion / Positioning Systems - Methods and Principles. §§3.1–3.2: repeated approaches, static readout, interferometer/autocollimator and paired reflectors; §§4.1–4.4: direction-specific means, scatter, reversal and repeatability. Manufacturer's stated method, including its declared adaptations of the cited positioning-test standards.

Additional locators: §4.3, axis-wide maximum of absolute directional mean differences; §4.4, unidirectional and bidirectional aggregation conventions.

Manufacturer tutorial, Glossary: Design Resolution is theoretical from screw/gearing/motor increments; Minimum Incremental Motion is repeatedly executable movement. Backlash, elastic drivetrain effects and friction distinguish commanded and load motion. Used for terminology and physical mechanism only; original chosen drive and repeated-move data are not product measurements or recommendations.