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6" (150mm) Precision Level, Accuracy 0.02mm/m Strip Level with Wooden Box Used to Test the Flatness and Horizontal Position of Equipment - Amazon.com
Industrial level 0.02mm 100/150/200/250/300mm High precision Mechanical Bar Level spirit level Instrument Measuring Tool - AliExpress
Precision Spirit Levels | FINE TOOLS
8" Precision Inspection Machinist Spirit Level, Accurate to 0.02mm/met — Taylor Toolworks