For weight - scales, for length or height, tape measures.
The barometer is the instrument that is used to measure the air pressure.
A ton for a rough and ready measure. A tenth of a ton (100 kilograms) if you were a biologist following the elephant's development in more detail.
This instrument is an adequate type of balance.
tympanometer
A thermometer or pyrometer.
The instrument used to measure the total distance that a car has traveled is called an odometer.
A tape measure.
Raisin
pressure gauge
You measure the height and deph of the elephant and multiply it. a bit more also.
You would use the unit of measure called "kilograms" to measure the mass of an elephant.
trumpet
No, you would measure cows in pounds.
Piano
piano,drum
You are a car!
The instrument used to measure humidity is called a hygrometer.