standing way referring to fig1 e in mode 4 the heading spo2 and pr is displayed in a landscape upright standing way measurement parameters 98 and 80 are displayed in a landscape upright standing way and a landscape solid waveform is displayed referring to fig1 f in mode 5 the heading spo2 and pr is displayed in a landscape upright standing way measurement parameters 98 and 80 are displayed in a landscape upright standing way and a landscape outlined waveform is displayed when the fingertip oximeter is powered on and initialized the operating modes and parameters of the display are set up at the beginning of measurement the display mode is set to 0 initially referring to fig2 according to an embodiment of the present invention as the central processing unit cpu 12 detects that the button 11 is pressed down for one time the display mode is updated once when the button 11 is pressed down again the display mode is also updated again each time the button 11 is pressed down the display mode is switched from mode 0 to mode 5 one by one and then to go back to mode 0 to continue the next cycle again therefore the measurement result can be easily observed from any of surrounding directions these six display modes form only one embodiment of the present invention other display modes are also possible in practice according to the present invention for example the central processing unit 12 can be.