A measurement device, comprising: a housing sized and shaped to be held in a hand; a set of sensors configured to sense a set of electrical characteristics of an electric signal in an insulated wire without galvanically contacting the insulated wire; a display provided on the housing; and one or more processors located in the housing, the one or more processors operatively coupled to the set of sensors, wherein in operation the one or more processors: receive a set of measurements, from the set of sensors, obtained by the set of sensors during a measurement time interval, the set of measurements indicative of the set of electrical characteristics of the electric signal in the insulated wire; evaluate whether measurements in the set of measurements satisfy a type of deficiency condition of a plurality of types of deficiency conditions, each type of deficiency condition of the plurality of types of deficiency conditions being associated with a corresponding deficiency indicator of a plurality of deficiency indicators; detect a defined deficiency associated with the electric signal in the insulated wire based on a determination that one or more measurements of the set of measurements satisfy the type of deficiency condition; and display, on the display, a deficiency indicator representative of the defined deficiency associated with the electric signal in the insulated wire in response to detecting the defined deficiency, the deficiency indicator being associated with the determined type of deficiency condition. a housing sized and shaped to be held in a hand; a set of sensors configured to sense a set of electrical characteristics of an electric signal in an insulated wire without galvanically contacting the insulated wire; a display provided on the housing; and one or more processors located in the housing, the one or more processors operatively coupled to the set of sensors, wherein in operation the one or more processors: receive a set of measurements, from the set of sensors, obtained by the set of sensors during a measurement time interval, the set of measurements indicative of the set of electrical characteristics of the electric signal in the insulated wire; evaluate whether measurements in the set of measurements satisfy a type of deficiency condition of a plurality of types of deficiency conditions, each type of deficiency condition of the plurality of types of deficiency conditions being associated with a corresponding deficiency indicator of a plurality of deficiency indicators; detect a defined deficiency associated with the electric signal in the insulated wire based on a determination that one or more measurements of the set of measurements satisfy the type of deficiency condition; and display, on the display, a deficiency indicator representative of the defined deficiency associated with the electric signal in the insulated wire in response to detecting the defined deficiency, the deficiency indicator being associated with the determined type of deficiency condition. receive a set of measurements, from the set of sensors, obtained by the set of sensors during a measurement time interval, the set of measurements indicative of the set of electrical characteristics of the electric signal in the insulated wire; evaluate whether measurements in the set of measurements satisfy a type of deficiency condition of a plurality of types of deficiency conditions, each type of deficiency condition of the plurality of types of deficiency conditions being associated with a corresponding deficiency indicator of a plurality of deficiency indicators; detect a defined deficiency associated with the electric signal in the insulated wire based on a determination that one or more measurements of the set of measurements satisfy the type of deficiency condition; and display, on the display, a deficiency indicator representative of the defined deficiency associated with the electric signal in the insulated wire in response to detecting the defined deficiency, the deficiency indicator being associated with the determined type of deficiency condition.