Precision Tools

Ruler Trainer

Learn to read a 6" machinist pocket scale with 4R graduations. Practice 8ths, 16ths, 32nds, and 64ths in free mode or test your skills in quiz mode.

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Click or drag along the ruler to position the pointer. It snaps to the finer scale.

Scroll wheel: move by one graduation. Arrow keys: Left/Right to adjust.

Hold Shift for finer movement (half-step). Both scales are visible on each side.