Mass Measurement Tool

Steps:

• Recall that mass is the amount of matter in an object, measured in grams or kilograms.
• Identify equipment by its primary function: balances compare masses directly.
• Eliminate options not related to mass: meters measure length, cylinders measure volume, newton meters measure force.
• Confirm balance as the standard lab tool for precise mass determination.

Why A is correct:

• A balance measures mass by equating the gravitational pull on an object to known masses, based on the principle that equal masses balance equally.

Why the others are wrong:

• B measures length or distance, not mass.
• C measures liquid volume, not mass.
• D measures force (newtons), not mass directly.

Final answer: A