Takes error-prone calculation out of the process of mitre cuts. Simply set the saw to the angle needed. Upside down or backwards, the reading is always correct. ABS Plastic Construction Measures from: 1 - 90° Measures Angles for Mitre & Single Cuts Saves Time & Reduces Waste Ideal for Carpenters, Plumbers & Builders 2 Easy to Read Scales Reads Correct Upside Down & Backwards Prevents Mitre Cut Calculation Errors ABS Plastic Construction Measures from: 1 - 90° Measures Angles for Mitre & Single Cuts Saves Time & Reduces Waste Ideal for Carpenters, Plumbers & Builders 2 Easy to Read Scales Reads Correct Upside Down & Backwards Prevents Mitre Cut Calculation Errors