Is a pulse oximeter monitor places inside the ear to measure the oxygen saturation level in the blood?

No, a pulse oximeter is typically not placed inside the ear; it is generally used on a fingertip, earlobe, or toe. The device measures oxygen saturation levels in the blood by shining light through the skin and detecting changes in light absorption by oxygenated and deoxygenated blood. While some specialized devices may use ear measurements, standard pulse oximeters do not.