Also, take it off the tree, leave it braced, place the back of the handle against a straight edge, i use a wall, and measure the distance of the tips to the wall or whatever edge. You want them to be within half an inch.
Another trick I learned from Lebhuntfish on here, is to mease on the string every 6 inches, starting at the tips. Measure from the string to the belly. Comparing that distance between left and right limb will tell you what limb is bending more and where. You can go every inch on the string if you really want to compare.
Also, i leave it braced, trace the outline, then flip the bow on that outline to compare again.