Electronic Folding Measuring Wheel with 8 Measure Memory, Professional Metal Frame Spoked 15-1/2" WheelMP401E Electronic Measuring Wheel With 8 Measurement Memory Electronic Features 8 Measurement Memory save up to 8 measurements Multiple Measurement Increments selectable Feet and Inches Feet and 10ths Metric in Meters to to decimal points (10ths & 100ths) Add Radius if measuring point to wall or wall to wall, you can add the radius of the wheel once or twice to get the correct distance to the wall from the center of the wheel. Area Calculates the area