Kilometers
Kilometres
metres
Metres.
yards or meters
a centimeter
Most likely in kg, because it would be at least 1 kg.
I would use meters.
ab frog
A door is about 2 meters, but most likely you'd measure in centimeters.
If you mean measure height then it would be the metre if you mean measure weight it would be Kilograms
With a tape measure.
metres
ruler
kilometers
Metres.
You would use meter's to measure an oak tree's height.
A measuring tape or a laser distance measurer would be suitable tools to measure the height of a ceiling.
Meters for height Kilograms for mass.