Once you know which the proper pressure for your tires is, you are ready to check them. In order to do this, you must unscrew the caps on the tire air valve and press the tire pressure gauge against it. You should make sure you keep the tire pressure gauge as firmly against the tire valve as not to let air come out from it.
Once you have the tire pressure gauge connected with the tire valve, the gauge will immediately tell you what the tire pressure is. This will allow you to learn weather the tire needs more air or its air pressure is correct. If it needs more air, you should do it carefully in order not to pass its air limit. And, in case its air pressure is correct, you simply need to disconnect the air pressure gauge from it and screw the valve cap back in its place.
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