Product Description 152-391 Mitutoyo Micrometer Head for XY Stage: 0-1" (Y-Axis) The Mitutoyo 152-391 Micrometer Head for XY Stage has the following specifications: Range: 0-1" Graduations: .0001" Accuracy: +/- .0001" Stem Diameter: .709" Stem: Plain Spindle Face: Flat (Hardened) with Non-Rotating Device Notes: For Y-Axis, Bidirectional graduations Features: Non-rotating device is attached to the spindle top. Floating thimble allows easy zero setting at any spindle position. Bidirectional graduation for easy reading in both directions. Adjustable spindle can be moved with the thimble held at any position, allowing easy zero-setting. Technical Data: Spindle Pitch: 1mm Spindle face: Flat (hardened) or spherical with carbide tip (more than HRA90), lapped surface Scale surface: White anodized aluminum.