You can't. But then again, being entirely electronic, it should never go out of tune to begin with.
80% of 670 = 80% * 670 = 0.8 * 670 = 536
23% of 670 = 23% * 670 = 0.23 * 670 = 154.1
670 meters equals 670 meters.
670.
0.0134
670
670 is ten times bigger than 67.
670 is not Perfect.
There are no units in 670.
Half of 670 is 335.
33,500 = 50 x 670 335 = 50% of 670
670 cm = 6.7 metres.