Muffler (silver) and exhaust pipe on a Ducati 695 motorcycle. A muffler (silencer in English) is a device for reducing the amount of noise emitted by the exhaust of an internal combustion engine.
Quick Answer. Normal blood sugar levels should be  less than 100 mg/dL when fasting and less than 140 mg/dL two hours after eating, according to WebMD. People without diabetes tend to have blood sugar levels of around 60 to 90 mg/dL before eating.
A normal random (non-diabetic) blood sugar is usually. between 70-140 mg/dl (3.9-7.8 mmol/L). Normal fasting. values are usually between 70 and 100 mg/dl (3.9-5.5. mmol/L). For purposes of this book, we define a true low. blood sugar as < 60 mg/dl (< 3.2 mmol/L). The Amercian.