Even in 6 digit meters, the last digit shows the tenth of a meter. THAT is why it has a different color (white as opposed to black for other digits).
Also, a meter is never a true gauge to measure. It can be tampered with very easily. You can drive the car with the meter cable unplugged and viola the meter reading wouldn't change even if you make a trip from karachi to khunjarab. So always check condition of the car & the engine before buying.