2 in 1 Digital ProtractorMeasure not only length but also 360 angle (i.e. inside angle, outside angle). With a convenient lock button to lock the protractor in any position. Good Material The material is super strong nylon fiberglass construction material, which has good stiffness and durability. good wear resistance, not easy to deform, no scratched hands, it is a good choice for carpenters, plumbers. Length and Angle Measurement Range Length measurement : 300mm; Angle measurement range: 000.0~999.9; Precision; 0.5; Resolution: 0.05/3'; Professionally measure inside and outside corners and angles of objects. With LCD displayHD LCD with electronic digital display, automatically shuts off for 5 minutes With D/M key, you can switch between degrees and minutes. HOLD and Zeroing function With the HOLD button, you can save data during the measurement, with the ON / OFF / ZERO button, you can press briefly press the button to save data at any angle