Durable, Lightweight and Compact. The measuring wheel is easy to use, simply press the reset lever on the counter meter. One person operation which automatically records measurements as you walk. Counter adds when walking forward and subtracts in reverse, making it easy to correct over measurement. The mechanical counting head has a 5 digit read out & comes complete with inbuilt torch light facility for night use. Folds up for storage in a durable canvas carry bag. Has a seperate stand to allow wheel to be freestanding. Wheel Diameter is 318mm. Weight in use is 1.53kg. Measures in cm to 10,000mtr.