The device used to check heart beat is ______

Explanation

**Step-by-Step Text Solution:**

1. **Identify the Device**: The question asks for the name of the device used to check heartbeats.

2. **Recall the Function**: The device is primarily used by doctors to listen to the sounds made by the heart, which includes heartbeats.

3. **Name the Device**: The device used to check heartbeats is called a **stethoscope**.

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