The Bosch GWM 32 Professional Measuring Wheel has a lightweight aluminium construction for ease of use. Its ergonomic pistol grip and telescopic shaft with continuously variable height adjustment for more flexibility and comfort. The die-cast aluminium wheel is fitted with a robust rubber tread for use on any surface. Specifications: Wheel Diameter (Circumference) : 318.5mm (1m) Max. Measured Value: 9999.9m. Measurement Accuracy: +-1 dm/100m. Weight: 1.4kg.