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A Balance in Science is an instrument used to measure mass.
Depends on the context. You could use a ruler, a tape measure, vernier calipers, a trundle wheel, or a laser ranging device.A ruler is an example of an instrument that is used to measure the length of smaller objects (usually around a foot or smaller).
Astronomical Units are too small to be a useful unit of measure, therefore light years are used.
This depends on the length of the object.You can use mm for very short objects, cm for short objects, m for long objects; and working with a microscope we use μm.
Milliy
take a measuring tape and measure the distance between the two objects
It is a mediaeval instrument for measuring the altitude of the sun and other sky objects, now replaced by the sextant.
To measure length around objects.
One could use a caliper to measure relatively small objects. Also, a scale would measure its weight. If it is regularly shaped with some straight edges, use a ruler.. You can drop it in a measuring cup half full of water and measure how much water it displaces.
Mass
sex·tantˈsekstənt/nounan instrument with a graduated arc of 60° and a sighting mechanism, used for measuring the angular distances between objects and especially for taking altitudes in navigation.
measuring tape, ruler, sticks, hand
measuring instrument in which the echo of a pulse of microwave radiation is used to detect and locate distant objects
calipers can measure its diameter and check for roundness. Water displacement can measure its volume.
Calipers are for measuring diameter of rounded objects. For instance you measure a ball, then carefully not changing the measurement pull the caliper off the ball and measure the gap between it's points with a ruler.
graduated cylinder
The measure of the force of attraction between objects due to gravity is WEIGHT. ^_^