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The best tool to measure the mass of a pair of glasses would be a digital scale. A digital scale provides accurate measurements in grams or ounces, which are commonly used units for measuring the mass of small objects like glasses. To measure the mass accurately, place the glasses on the center of the scale and ensure it is calibrated properly for precise results.
No singe tool will do all four measurements.
The unit of mass in SI is kilogram (kg).
depends on what item you are measuring
It depends which property you are measuring. For linear dimensions a tape measure would be best