Well, when I roll the measureing wheel out and notice it "skipping", I tend to remeasure (somethimg, I'd prefer not to do) and the differences have been upwards of a foot. And I've remeasured a couple of times 3 or 4 times just to check this inaccuracy. This was with the smaller wheel. With the larger wheel I don't have that much of a challenge. Now, I usually just point the laser and it takes less time for sure. Also, I buy the cheap 25' or 30' tape measures from B&D or Stanley ($10 jobbers @ Home Depot or Lowes), but I have a hard time getting them to stay at one end while I draw the tape out. They continuously slip from the grip. Is there a recommended tape measure that will stay where you anchor it? Is it one of those, "you get what you pay for" deals? Kirk