A blood glucose monitor (BGM) is a device for measuring the approximate concentration of glucose in the blood. A small drop of blood obtained by pricking the skin with a lancet is placed on a disposable test strip, which the monitor reads and uses to calculate the blood glucose level. The monitor then displays the level in mg/dl or mmol/l.
Altitiude - Accurate monitor results are not guaranteed at altitudes greater than specified for the monitor. However, due to the fact that airplanes are pressurized, the monitor will operate as if there has been no change in altitude while in flight.