Since Samantha is doing a lab in her fifth grade science class and she needs to compare the masses of two blocks of wood, the tool she should use are Balances and Scale.
Balances and Scale is been used with everyday objects and the balance help in the determination of object's mass.
In this case, it should be noted that The balance compares an object with a known mass, hence the tool she should use are Balances and Scale.
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