Re: meter accuracy
Unfortunately, meters only need to be accurate to within 20%. Some are much more accurate than that at the middle ranges, but then creep toward the outer levels of that inaccuracy at the extremes (like extremely high or extremely low.) I stopped using one meter because it was very inaccurate on the low end of the range.
If you get symptoms of lows, which can include feeling shaky, sweaty, dizzy, confused, nauseaous, weak, etc., and your meter says you're low, then assume it's accurate and eat something.
Also, if you have hypoglycemia, do a search for hypoglycemic diets. You can prevent the lows by making sure you never eat carbohydrates without also eating some protein and fat...the fat slows the absorption of the carbs and the protein takes longer to absorb, so after your body puts out its insulin rush, there will still be something hanging around for the insulin to work on.