The saturimetro finger and it has been constructed for measure the two main parameters: the quantity of the oxygen contained in the blood (SpO2) and heart rate (BPM). The small size and low weight (52 grams complete with batteries - the batteries, 2 AAA batteries are not included) make it practical and pocket. Extremely easy to use: just insert the finger in a special compartment, and press the main button. The OLED display has various display options including with waves the graphical representation of pulse. The function of auto power off ensures a long battery life. Illustrated instructions in English