Feature: The wheel surface is made of wear-resistant thickening rubber, which is anti-deformation and anti-slip, durable in use. Mechanical gear counter design, forward count, back to decrease. Retractable guide rod, easy to carry and store. Ergonomic grip design, comfortable to hold. Large display dial with manual data reset, easy to read and use. Suitable for large area measurement, road construction survey, field management and traffic accidents measurement, etc. Spec:Material: Plastic & MetalWeight: 1950g/68.8ozMeasuring Range: 10000m / 9999.9ftAccuracy: + / - 0.5%Display Resolution: 0.1mWheel Diameter: 318mm/12.5inchExpansion Length: Approx. 1000mmOne Round Measuring Range: 1mPower: 1.5V 2* AAA batteries (NOT Included)Working Temperature: 14 ℉ - 113 ℉ (10 ℃ - 45 ℃)Package List:1 x Distance Measuring Wheel1 x 5m Steel Measure Tape1 x Portable Package Bag