Finger Pulse Oximeter with CE approved 1.Displaying volume and column diagram of stroll. 2.4 directions, 8 display Finger Pulse Oximeter with CE approvedFunction:1,Monitoring pulse, SpO2,PR(Pulse Rate).2,Displaying volume and column diagram of stroll.3, 4 directions, 8 display. Description:1,Display Method: Color OLED display, two display directions.2,The product is small in size, light in weight ...