| A | B |
|---|
| Below 18,000', an Altimeter is adjusted to | Actual Local Sea Level Pressure |
| Above 18,000', an Altimeter is set to | Standard Day Sea Level Pressure |
| AGL | Altitude above the ground |
| MSL | Altitude above sea level |
| The altimeter's longest needle | Reads hundreds of feet |
| The altimeter's mid-length needle | Reads thousands of feet |
| The altimeter's shortest needle | Reads tens of thousands of feet |
| Reads barometic pressure | Kollsman window |
| Metric unit of pressure | Millibars |
