This is where Dr. Bernstein's law of small numbers comes in handy, especially for Type II's. If you are eating low carb, your blood sugar is generally not going to have huge swings, so the meter is going to give you a good idea of how you are doing and what foods are no-no's.

When I get a reading that seems out of whack for what I have eaten, sometimes I retest and get a number closer to what I was expecting. Sometimes I just ignore the number figure it is an error.

I have found that the average from my meter, One Touch Ulta Mini, tracks fairly well with my lab A1c results.