A system comprising: an enclosure comprising: a first printed circuit board, housed within the enclosure, the first printed circuit board comprising a processor and a memory, wherein the memory is coupled to the processor; a display, coupled to the processor, wherein the display is visible from an exterior side of the enclosure; a battery, housed within the enclosure, coupled to the processor and the display; and a probe tip, coupled to an exterior side of the enclosure, comprising at least a first sensor opening, a second sensor opening, and a third sensor opening, wherein a first distance is between the first and second sensor openings, and a second distance is between the first and third sensor openings, and the first distance is different from the second distance; executable code, stored in the memory, wherein the executable code is executable by the processor, the executable code comprising a first code to receive first data associated with the first and second sensor openings of the first distance, a second code to receive second data associated with the first and second sensor openings of the second distance, and a third code to perform spatially-resolved spectroscopy using the first and second data; a second printed circuit board, coupled to the processor, positioned at a first end of the probe tip, a plurality of photodetectors mounted on the second printed circuit board at the first end of the probe tip, the first sensor opening is formed in the second printed circuit board, the second sensor opening is formed in the second printed circuit board; a first source diode coupled to the processor; a second source diode coupled to the processor; a first optical fiber, coupled between the first sensor opening and the first source diode; and a second optical fiber, coupled between the second sensor opening and the second source diode, wherein the first optical fiber transmits radiation emitted by the first source diode to the first sensor opening to irradiate the tissue to be measured, and the second optical fiber transmits radiation emitted by the second source diode to the second sensor opening to irradiate the tissue to be measured. a first printed circuit board, housed within the enclosure, the first printed circuit board comprising a processor and a memory, wherein the memory is coupled to the processor; a display, coupled to the processor, wherein the display is visible from an exterior side of the enclosure; a battery, housed within the enclosure, coupled to the processor and the display; and a probe tip, coupled to an exterior side of the enclosure, comprising at least a first sensor opening, a second sensor opening, and a third sensor opening, wherein a first distance is between the first and second sensor openings, and a second distance is between the first and third sensor openings, and the first distance is different from the second distance; executable code, stored in the memory, wherein the executable code is executable by the processor, the executable code comprising a first code to receive first data associated with the first and second sensor openings of the first distance, a second code to receive second data associated with the first and second sensor openings of the second distance, and a third code to perform spatially-resolved spectroscopy using the first and second data; a second printed circuit board, coupled to the processor, positioned at a first end of the probe tip, a plurality of photodetectors mounted on the second printed circuit board at the first end of the probe tip, the first sensor opening is formed in the second printed circuit board, the second sensor opening is formed in the second printed circuit board; a first source diode coupled to the processor; a second source diode coupled to the processor; a first optical fiber, coupled between the first sensor opening and the first source diode; and a second optical fiber, coupled between the second sensor opening and the second source diode, wherein the first optical fiber transmits radiation emitted by the first source diode to the first sensor opening to irradiate the tissue to be measured, and the second optical fiber transmits radiation emitted by the second source diode to the second sensor opening to irradiate the tissue to be measured.