precision engineered to the highest quality one person operation automatically records measurements as you walk suitable for: builders farmers road contractors council schools’ real estate police accident investigators allowing the user to correct a measurement if oversteps mark the mechanical counting head has face digit read out complete with built-in torch light facility for night use durable canvas carry bag included specifications: wheel diameter: 318mm measures to (by cm): 10,000 m weight in use: 1.53kg Item Features: Suitable For Land & Road Measurement. Illuminated Panel with Buttons. Counter Adds When Moving Forward & Subtracts When Reversing. Attachable Kick Stand & FREE Carrying Bag Included 318mm Measuring Wheel.