First Google result for "Compression Tester" =
First Google result for "How to check compression" =
Second Google result for "How to check compression" =
Other Google results for "How to check compression" =
Basically you pull your sparkplug, screw a gauge into the hole where the sparkplug was, and with your coil wires removed, you have someone crank the engine while you read the max level on the gauge. People often squirt a couple squirts of oil in the cylinder through the hole first, so you'll get a good seal at the rings and get a decent reading.
A basic compression gauge costs around $30 at auto-parts stores, but you can find them anywhere from $15 to $90. You can also just take your car to an auto repair shop and they can do it for you in exchange for a small amount of money, which they can quote you beforehand if you ask.
If you seriously have no clue how to rent a tool from your local auto parts store, or don't trust them to provide you with instructions, or don't trust yourself to do it properly, just go to an auto shop and pay them to do it. You'll save much time and get more solid answers from people who literally do it every day, and will be able to give you professional advice.
An alternative, if you live near any of the gearheads on this forum, is to purchase a case of beer and invite a gearhead to stop by on a weekend and check it for you.
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