Centre head: To locate centre of cylinder with diameter (Ød): 30 - 100mm, Accuracy: ±0.15mm. Protractor head: To set the blade at desired angle to an edge of a work piece, and can be used to measure angles, Range: 0-180°, Accuracy: ±7min. Square head: To set the blade at 90° or 45° to an edge of a work piece, Accuracy: ±8min for 90° square, ±10min for 45° square.
