These tools are not used daily...sometimes they're designed for only one operation.
It 's used when checking valves clearance. Using the right combination of gauges can provide any thickness, and so do accurate mesures.
Necessary for untighten nuts you can't access with a ring wrench, and you could destry with a classical wrench. Typical application is for brake lines.
The three-in-one tool to perform air bleeding of braking system. Keep the cover of the pot, make a little hole in it and pass the pipe through the hole to avoid the pipe to fall from the pot and the brake fluid to be spread on the ground.
You can guess that its purpose is to remove circlips...
On some bikes, you need a special tool to remove the lock nut. This tool may be quite expensive, so, if you have a friend who's got machine tools....
Absolutely necessary to measure many things : brake pads, brake disks, fork adjustement...
It costs, but it's worth buying it if you have half professional servicing ambitions. It will be your best friend to inflate tires, do painting using airguns, sand. For that kind of operations, a little model is enough (50 L and 1.5 HP).
Used for carburetors synchronization. 4 columns, mercury, and you're done, you can't find a more accurate tool.