Park Tool. I am a proud owner of a Park Tool Pedal Wrench PW-3, a really great product made in USA!
Image above courtesy of REI.com
This wrench has made my life so much easier when it comes to removing pedals. It provides superb torque that even I can remove any ole stubborn pedal.
Now, back to where I digressed :)
The Chain Wear Indicator comes with crystal clear instructions.
I followed the instructions in English :)
Gikma's chain appears to be in good shape :)
At least for the time being, I can rest easy that I won't have to replace any expensive sprockets due to uneven chain wear.
If I can do it, so can you. So, you may want to check your chain ASAP :)