The appropriate unit to measure weight is the newton. Now, if it is really the mass you wanted, you could use kilogram or gram.
Milligrams
Grams is no good - it is a measure of weight not length. Kilometers measure length - but only if your table-top is a few miles long. Most appropriate would be Meters - your average dining table is about one-and-a-half meters long.
What is the most appropriate instrument to measure
inches
A tenth of a metre.
kilograms
You would measure a dog's weight in pounds--if that is your question.
A good measure would be Tons (2,000 pounds)
The most appropriate unit of weight for a computer would be in pounds.
full=ounces, empty=......ounces?
Grams is no good - it is a measure of weight not length. Kilometers measure length - but only if your table-top is a few miles long. Most appropriate would be Meters - your average dining table is about one-and-a-half meters long.
the same
Length would be the most appropriate unit of measurement
What is the most appropriate instrument to measure
inches
Meters
A tenth of a metre.
millimeter