Ear Training for 3 Draw Bends
If you're working on bending accuracy (when are we not!), then you already know you're wasting your time if you're not using a tuner or at least a piano to reference your pitch. There are times when we're not around such helpful devices and it's handy to have a different kind of reference...
Part of ear training is to develop a tune list of intervals. Here are some good references...
Whole Step Bend - "Three Blind Mice" 3 3" 2, 3 3 3" 3" 2
Half Step Bend on 3' - "Spoonful" = 3' 2 3' 2 3' 2
Half Step and Whole Step Bend - "There's a Place in France" 2 3" 3' 3" 2, 2 3" 3' 4 3' 3" 2