I personally have a hundredths scale (.00) that I use. It is just what I prefer now. When I first started collecting I had a tenth scale (.0) that worked just fine for me. I think what @Oldhoopster was inferring is that a single digit gram scale, without tenths or hundredths, is basically useless for a collector. A case in point example is simply differentiating between a copper and a zinc Lincoln (if you can't just tell by looking at one). A single digit gram scale will round up or down to the nearest whole number which is basically useless when it comes to telling what type of Lincoln you have due to the weight tolerances of these coins. If this single digit scale's "brain" reads a zinc Cent to be 2.5 grams (even though it's still a single digit readout) it will round up to a reading of 3 grams on this type of scale. The same holds true for a copper Cent that normally weighs 3.1 grams, it will round down to 3 grams. This I believe is why a single digit reading gram scale is of no use. I believe this would also hold true for other denominations of coins as well. I think a tenths readout scale is perfectly fine for the most part.