Abstract: In some examples, an electric current detection device includes a conductor to which an electric current to be measured is applied, and a circuit unit that has at least a pair of magnetism detection elements for respectively detecting magnetic fluxes generated around the conductor by the electric current. The electric current may be detected based on detection signals obtained from the magnetism detection elements. The magnetism detection elements have a detection sensitivity relative to magnetic fluxes in a parallel orientation. Further, the magnetism detection elements are arranged at positions that are asymmetric positions that avoid a cross-section center of the conductor and that have mutually different distances from the cross-section center. Additionally, the magnetism detection elements are opposed to each other by sandwiching a line that passes through the cross-section center and which is perpendicular to a direction along which the magnetism detection elements are aligned.

Abstract: An electric cutting tool includes: a surface plate; a body portion tiltably provided on the surface plate; and a circular saw blade capable of rotating by means of driving power from a driver. A movement amount measuring section measures a movement amount of the body portion with respect to the surface plate in response to a tilting action. A calculating section calculates a cutting depth of the circular saw blade or an inclination angle of the body portion on the basis of the movement amount measured by the movement amount measuring section. A display section displays the cutting depth or the inclination angle of the body portion calculated by the calculating section. The movement amount measuring section includes: a scale section installed on any one of the surface plate and the body portion; and a scale detecting section installed on the other.