Name the instrument used for measuring specific rotation.

Explanation

**Step-by-Step Solution:**

1. **Understanding Specific Rotation**: Specific rotation is a property of chiral compounds that describes how much the plane of polarized light is rotated when it passes through a sample of the compound.

2. **Identifying the Instrument**: The instrument used to measure this specific rotation is called a polarimeter.

3. **Function of the Polarimeter**: A polarimeter measures the angle of rotation of polarized light as it passes through a sample.

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