I would use meters
centi I would suggest the meter (metre). A football field is 100 yards, or 91.44 meters.
Yes. If the baseball field is 120 m long then it would be 120 000 mm. 1000 mm = 1 m
Length would be the most appropriate unit of measurement
The High powered field of view is harder to measure.
an Obisometer
An odometer.
acres, hectares, yards2, meters2, etc.
Neither. I would use a centimetre.
In the US, I would use yards.
Usually, you would use kilometers.
Yards
Metres
Yards, but you could also use meters.
The meter.
I would use meters
Tape measures or laser range-finders would do that.