"The Keson Electronic Measuring Wheel is ideal for contractors, estimators, engineers, landscapers, paving contractors, fencing specialists, real estate professionals, utility personnel, surveyors, police work, facility engineers and telecommunications contractors. Swan-neck, ergonomic handle and thumb-up grip ensures less wrist strain and superior control. Rugged 3/4in. steel tubing makes Keson frames the strongest in the field, while the wheel rolls easily over the toughest terrain and withstands constant heavy use. Wheel Diameter in. 15 1/2, Foldable or Retractable Height in. 21, Overall Height in. 42, Measures up to ft. 99,999, Stand Included Yes, Material Steel frame, metal spoked wheel, Case Included No, Color Yellow, Wheel Circumference ft. 4, Foldable or Retractable Handle Foldable. Reliable input system magnetic sensors are not disturbed by dirt and debris Safety reflector makes user more visible Backlight LCD display for low-light usage Auto shut-off extends battery life Sealed counter encasement allows you to safely clean entire wheel with a damp cloth Digital counter placement protects it from contact with ground Display LCD segment 7 digits up to 99,999 ft. 11 in. or 99,999.9 in tenths and metric Number size 1/2 in. Memory 8 measurement recall Add wheel radius for wall-to-wall measuring Units feet & inches continuous inches feet & 10ths decimal feet metric Calculations Length, area Power 2 AA batteries not included Maximum speed 10 MPH 16.25 Km/h Accuracy 2in. in 100 feet, 99.8"