Superior performance, design and quality. Built to last. Our measuring wheels "measure guide(r)' enable you to measure by yourself. You measure when you want to, at great savings in labor costs and time. It's easy to measure curved , horizontal and vertical surfaces. All wheels are specifically calibrated to the counter. You measure from an upright position, no stooping or squatting, allowing operator to be aware of surroundings, traffic, etc. Easy to carry from job to job. It's ideal for quick estimating jobs. Automatically records measurements line to line, wall to wall, vertically, overhead, around curves and over contours. You don't need a helper to hold the end of the tape for all indoors and outdoors measuring. You measure when you want to, counter total is always in view.