got it now.Yes you can measure from the stud of the carbides on the ski's.Your toe out should be between 1/4" to 1/2" max.
JUST A NOTE: When you do the adjustment for toe out..make sure tank is full,place weight on the sled equal to you fully dressed and then set your toe out,other wise it will be to much when you sit on the sled.Notice how the ski's toe out when you sit on your sled..try it sometimes.