Air-fuel ratio meter is like a magic tool that helps to measure how much air and gas are being mixed together in an engine or a machine.
Imagine that you are playing with your building blocks and you have two different kinds of blocks that you want to put together. One block is blue, and the other block is red. If you want to make a pretty pattern, you need to have the right amount of each block to make it work.
In the same way, an engine needs to have the right amount of air and gas mixed together to work properly. If it has too much air, the engine won't produce enough power. But if it has too much gas, it will waste fuel and produce bad emissions.
That's where the air-fuel ratio meter comes in. It's like a tool that measures how much blue and red blocks you have and tells you if you need to add more blue blocks or red blocks to make the perfect pattern.
The air-fuel ratio meter does the same thing for engines. It measures how much air and gas are being mixed together and tells you if you need to adjust the mixture to make it work better.
By using the air-fuel ratio meter, mechanics and car enthusiasts can make sure that their engines are running as efficiently as possible.