Name the instrument which can measure accurately the following
the internal diameter of the neck of a water bottle

Explanation

To measure the internal diameter of the neck of a water bottle accurately, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Measurement Requirement**: We need to measure the internal diameter of the neck of a water bottle. This measurement requires precision due to the small size of the neck.

2. **Choose the Appropriate Instrument**: For measuring small internal diameters accurately, we can use a **vernier caliper**. This instrument is designed to measure dimensions with high precision.

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