Length
The metric unit used to measure length in International System (SI) is meter and it is represented by letter m.
Length can be measured by a metric scale.
Mass
The metric unit used to measure Mass in International System (SI) is Kilograms and it is represented by letter Kg.
Mass can be measured by an instrument called Balance.
Volume
The metric unit used to measure Volume in International System (SI) is Liter and it is represented by letter l.
Volume can be measured by a container called graduated cylinder.
Temperature
The metric unit used to measure Temperature in International System (SI) is Kelvin and it is represented by letter K.
Temprature is measured by most common divice called thermometer.