The Bosch GWM 40 Professional Measuring Wheel enables accuracy over long distance. Its robust steel construction provides high stability and long life. The easy to read 6-digit impact-resistant counter makes it ideal for jobsite use. Folds for easy transport. Specifications: Wheel Diameter (Circumference) : 389.1mm (1.22m) Max. Measured Value: 9999.9m. Measurement Accuracy: +- 5 cm/100m. Weight: 3.3kg.