A device has two diode laser sources in a range between 500 and 1000 nm, with a power in the range between 0.01 to 100 mW. Rays from the sources are conveyed through an optical condenser and, starting up a key, are emitted either on a nail or on the skin or even on a free blood sample. A photodiodic sensor or a CPU read the energy subtracted by glycate haemoglobin and free plasmic glucose. This value is converted into the immediate glycaemia value and appears on a device display.
