In order to check the amount of the air / fuel mixture, air fuel ratio meters are often used.
2.
Very early analog ratio meters consisted of a card with two holes, one blank and the other covered with a strip of neutral density.
3.
The degree of mismatch between the feedline and the antenna is measured by an instrument called an SWR meter ( standing wave ratio meter ), which measures the " standing wave ratio " ( SWR ) on the line.
4.
To prevent the Air-fuel ratio from going lean ( caused by increasing the boost beyond the fuel systems capacity ) care must be taken to monitor boost pressure levels, along with oxygen levels in the exhaust gas, using an air-fuel ratio meter that monitors the oxygen sensor.
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