A door is about 2 meters, but most likely you'd measure in centimeters.
meters
While the dog is standing up on all fours, measure from the floor to the top of the shoulder.
I would use Meters
ml stands for milliliters which is a measure of volume, not height. The metric system is easy to convert between. If you meant 100 mm . . . that would be the same as .1 meters OR 1 decimeter OR 10 centimeters. The question is also whether you are wanting to convert your measurement into English units from metric. If you meant to type 100 millimeters, you would have a distance of 4 inches or 1/3 of a foot.
The best answer for that is to say metres.
The metric unit commonly used to measure height is the meter. So, you would measure the height of Big Ben in meters.
kilometre
The metric measurement used to measure volume is the liter (L).
You would use meters.
You would use the metric unit of meters to measure the height of a gallon of milk.
meeters?
meters
What metric unit would you use to measure a computer keyboard
Weight and/or height
Feet.
Milligrams
the metric system