A device for non-invasively measuring glucose level in a subject comprising: a unitary external unit housing three technologically distinct measurement channels for measuring glucose, wherein all operative components for measuring glucose level are contained in a single housing constituting said unitary external device, the unitary external device having a first portion and an opposing second portion configured to receive a part of the subject's body therebetween; at least two of the technologically distinct measurement channels contained within said single housing of said unitary external unit, each technologically distinct measurement channel independently non-invasively measuring a value indicative of said glucose level, wherein each technologically distinct measurement channel measuring a value indicative of glucose according to a distinct measuring channel protocol is technologically different from measuring channel protocols of all other technologically distinct measurement channels; and a processor receiving a value indicative of said glucose level from each technologically distinct measurement channel and calculating a glucose level reading that is calculated by combining each of said glucose values from said technologically distinct measurement channels into a single glucose level; the at least two technologically distinct measurement channels consist of a first ultrasonic piezo element positioned on the first portion and a second ultrasonic piezo element positioned on the opposing second portion of said external unit, and a thermal measurement channel, characterized by a first membrane covering the first ultrasonic piezo element and a second membrane covering the second ultrasonic piezo element for measuring glucose levels utilizing ultrasonics and a heater and a thermal sensor both positioned on the first portion and spaced from the first ultrasonic piezo element for measuring glucose level by thermal characteristics. a unitary external unit housing three technologically distinct measurement channels for measuring glucose, wherein all operative components for measuring glucose level are contained in a single housing constituting said unitary external device, the unitary external device having a first portion and an opposing second portion configured to receive a part of the subject's body therebetween; at least two of the technologically distinct measurement channels contained within said single housing of said unitary external unit, each technologically distinct measurement channel independently non-invasively measuring a value indicative of said glucose level, wherein each technologically distinct measurement channel measuring a value indicative of glucose according to a distinct measuring channel protocol is technologically different from measuring channel protocols of all other technologically distinct measurement channels; and a processor receiving a value indicative of said glucose level from each technologically distinct measurement channel and calculating a glucose level reading that is calculated by combining each of said glucose values from said technologically distinct measurement channels into a single glucose level; the at least two technologically distinct measurement channels consist of a first ultrasonic piezo element positioned on the first portion and a second ultrasonic piezo element positioned on the opposing second portion of said external unit, and a thermal measurement channel, characterized by a first membrane covering the first ultrasonic piezo element and a second membrane covering the second ultrasonic piezo element for measuring glucose levels utilizing ultrasonics and a heater and a thermal sensor both positioned on the first portion and spaced from the first ultrasonic piezo element for measuring glucose level by thermal characteristics.