The Bosch Professional GAM 220 MF Angle Measurer is an essential tool for fast calculation and transfer of mitre angles. It features a memory function for frequently used angle dimensions and automatically calculates single and double mitre angles without the need for other tools. The measurement range is 0 - 220 degrees, with an angle measurement accuracy of ± 0.1 degrees and a vials measurement accuracy of ± 0.05 degrees. It offers approximately 80 hours of battery power and has an arm length of 40cm.