Mitutoyo 526-122-20 Series 526 2-Point Inside Measuring Instrument, Bore Gauge for Extra Small Holes, 0.3-0.4", 0.0001" Graduation, with Indicator

The Mitutoyo extra small hole bore gage features a split-ball design with stainless steel contact points to measure a hole's inside diameter and identify out-of-roundness issues with an accuracy to +/-4µ/.00016". 

Features:

• Inch models
• Each bore gage model comes with a set of different anvil sizes
• Models with dial indicators are fully protected by a rugged cover
• Gage stem diameter is 0.375"
• Interchangeable anvils are made of stainless steel for added accuracy and durability
• Supplied in a plastic case