It means air measuring device. The rule means definition #1. The throttle would, I suppose, fit definition #2. From Merriam-Webster:

Main Entry: me·ter
Function: transitive verb
1 : to measure by means of a meter
2 : to supply in a measured or regulated amount
3 : to print postal indicia on by means of a postage meter
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Well, a CIS flapper is a fuel metering device. And since they so nicely include metering devices in the definition of sensors, and other sensors can be replaced with equivalent (which I would take to mean 'performs the same function&#39, I guess you can replace the CIS flapper w/ some other type of fuel metering device.