A ruler
You would use kilograms (kg) to measure someone's mass in metric units.
What metric unit would you use to measure a computer keyboard
Litres
It would probably be miles.
To measure temperature in metric units, you would use Celsius degrees. Fahrenheit degrees are not considered metric units of temperature measurement.
What measure of units would you use to measure the thickness of a phone book
To measure a soccer field in the metric system, you would use a metric measuring tape or a measuring wheel. The units used could be meters or centimeters. In the English system, you would use a tape measure or a measuring wheel calibrated in feet or yards. The units used would be feet or yards.
Meters
one page of a phonebook is measured in mm. unit thickness of a phone book is cm
Meters should be used to measure the length of a tennis court in metric units.
Yards if you work in imperial units or metres if you work in metric units
The metric units used to measure the mass of your weight would be kilograms (kg) or grams (g).