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Based on your provided text, here’s how you can fill in the blanks:
Item A is a **triple beam balance** and is used to measure the **mass** of an item.
Item B is a **spring scale** and is used to measure the **weight** of an item.
So the completed sentences would be:
Item A is a **triple beam balance** and is used to measure the **mass** of an item.
Item B is a **spring scale** and is used to measure the **weight** of an item.