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.
Random Blood Glucose. The average level of glucose in the bloodstream of a normal adult ranges from 70 to 130 mg/dL before meals and less than 180 milligrams per deciliter, or mg/dL, 2 hours after starting a meal, according to the American Diabetes Association.A random blood glucose test can be done at any time.andom Blood Glucose. The average level of glucose in the bloodstream of a normal adult ranges from 70 to 130 mg/dL before meals and less than 180 milligrams per deciliter, or mg/dL, 2 hours after starting a meal, according to the American Diabetes Association. A random blood glucose test can be done at any time.