You know the expression, keep your finger on the pulse? This little device does it for you. Slip it onto the end of your finger and, with the press of a button, it checks oxygen saturation (SpO2 0% -100%) and pulse rate (25-250bpm, accuracy +/- 2%). Ideal if you struggle with COPD, sleep apnoea, palpitations or anxiety and a great reassurance between doctors appointments. Easy-to-read HD LED screen, wrist loop and storage bag. 2x AAA batteries (supplied). L6.2 x W3.7 x D3.2cm.