u stick a strip into a hand held monitor and then princk ur finger with the lancet and squeeze a drop of blood onto the strip and it reads ur levels. idealy as a non diabetic ur levels should be 5.5 and under, 2 hours after a meal.
you can pick them up quite cheaply at the chemist, ive seen some for $35,the one i have it about $60 because it can also test other things.

given u actually didnt know what causes a bigger bub and diabetes, can i suggest you look into it a bit more before you make your final decision, its really doesnt have much to do with your sugar intake