Having type2 diabetes, what is the bg nr i should never surpass,even after eating?is it 140 mg/dl , or can i go a bit above without having damage? thx

Optimal ≤120 mg/dL: While ≤140 mg/dL was long promoted based on "normals", this included many values/people who are already well down the 3-4 decade progression into Type II Diabetes Mellitus. The best evidence, from large human clinical trials done in Europe & published in 2001, was that cardiovascular events proportionally & progressively increase in humans with average glucose concentrations ≥100 mg/dL.

90-135: The range of fingersticks is 90-135. On occasion you can exceed 135 a little bit, but the vast majority of your fingersticks should be in this range.