A system configured to measure dimensional characteristics of a plurality of wood pellets, comprising - a device configured to acquire images, said device comprising - a box comprising, inserted to size, a drawer, said drawer being configured to comprise, in use, a group of wood pellets sampled in order to measure the dimensional characteristics of said group of wood pellets, - a sensor configured to acquire, in use, a graphical image of the drawer and of the group of wood pellets comprised in the drawer, and - a microprocessor connected to the device, and comprising - program modules configured to process and save information arriving from the device, said program modules comprising at least modules both for converting the image acquired by the sensor and for measuring the dimensional characteristics of the group of wood pellets, characterized in that - said sensor is an IR sensor, - said conversion and measurement modules comprise at least one module for converting the image acquired by the IR sensor into a grayscale image, - said drawer comprises, in a predetermined position, a reference object in a colour with high reflectivity against the bottom colour of the drawer, said reference object comprising known dimensional characteristics, and in that said program modules comprise - further modules configured to calculate a pixel/mm ratio of said reference object comprising known dimensional characteristics, and to compare the dimensional characteristics of the reference object with the dimensional characteristics of the group of sampled wood pellets. - a device configured to acquire images, said device comprising - a box comprising, inserted to size, a drawer, said drawer being configured to comprise, in use, a group of wood pellets sampled in order to measure the dimensional characteristics of said group of wood pellets, - a sensor configured to acquire, in use, a graphical image of the drawer and of the group of wood pellets comprised in the drawer, and - a box comprising, inserted to size, a drawer, said drawer being configured to comprise, in use, a group of wood pellets sampled in order to measure the dimensional characteristics of said group of wood pellets, - a sensor configured to acquire, in use, a graphical image of the drawer and of the group of wood pellets comprised in the drawer, and - a microprocessor connected to the device, and comprising - program modules configured to process and save information arriving from the device, said program modules comprising at least modules both for converting the image acquired by the sensor and for measuring the dimensional characteristics of the group of wood pellets, characterized in that - program modules configured to process and save information arriving from the device, said program modules comprising at least modules both for converting the image acquired by the sensor and for measuring the dimensional characteristics of the group of wood pellets, characterized in that - said sensor is an IR sensor, - said conversion and measurement modules comprise at least one module for converting the image acquired by the IR sensor into a grayscale image, - said drawer comprises, in a predetermined position, a reference object in a colour with high reflectivity against the bottom colour of the drawer, said reference object comprising known dimensional characteristics, and in that said program modules comprise - further modules configured to calculate a pixel/mm ratio of said reference object comprising known dimensional characteristics, and to compare the dimensional characteristics of the reference object with the dimensional characteristics of the group of sampled wood pellets.