Niigata Seiki SK Block Gauge, Grade 1 Equivalent, Individual 5.98mm, GB1-598

Used as a standard gauge for accuracy testing and comparative measurements of calipers, micrometers, dial gauges, etc.

Includes an inspection sheet with test values ​​to ensure accuracy.

An anti-rust sheet is included for easy maintenance.

Equivalent to Class 1.

Made in China Cross-sectional dimensions: 30 (0~-0.3) x 9 (-0.05~-0.2) mm Thermal expansion coefficient: 11.5 x 10-6/K Dimensional tolerance: ±0.20 μm (0.16 μm deviation)