This tool helps you find and learn a root's pentatonic scale's notes on the AECG fretboard.
1) Search for your root note at the bottom. It's column is your fret 1. Ignore everything left from there.
2) The gray boxes are the notes in you scale. Go from your fret 1 to see where they are on your fretboard.
3) The green boxes are the root note.
Example: If your root note is A, playing first fret on the C string is a note inside it's Pentatonic Scale. In the second fret, you can play on A, C and G string, last one being your root note.
Here are some external links that might be useful: