Tolerance is something you have to get used-to... I used to drive my dad crazy when I'd say "close enough" 
Nothing in analog is perfect. If you send your 'scope and meter out for calibration they probably still won't measure exactly the same but they will be within their allowed tolerance (or the calibration lab will tell you they can't meet the specs, etc.).
Sometimes we'll have a plus-or-minus spec and sometimes there will be a maximum or minimum but every thing has a variation/tolerance and every measurement has an error/ tolerance.
Oscilloscopes usually aren't as accurate as a meter. Oscilloscopes are for "looking at waveforms." The display is approximate and the displayed measurements are an "added feature". But of course it depends on the particular piece of equipment so your 'scope may be more accurate than my meter, etc.
...Eggs are digital - There is exactly one dozen eggs in a dozen eggs. Milk is analog - You'll never get exactly one gallon of milk but there are legal requirements so it can't be too much less.