Reddit reviews Zacurate 500BL Fingertip Pulse Oximeter Blood Oxygen Saturation Monitor with Batteries and Lanyard Included (Navy Blue)

ACCURATE AND RELIABLE - Accurately determine your SpO2 (blood oxygen saturation levels), pulse rate and pulse strength in 10 seconds and display it conveniently on a large digital LED display.SPORT/HEALTH ENTHUSIASTS - For sports enthusiasts like mountain climbers, skiers, bikers or anyone interested in measuring their SpO2 and pulse rate. SpO2 and Pulse Rate now faces instead of away from the user for easy read.EASY TO USE - Taking a reading is easy, just clip it on to your finger and turn it on at the press of a button.ACCOMODATES WIDE RANGE OF FINGER SIZES - Finger chamber with SMART Spring System. Works for ages 12 and above.LOADED WITH ACCESSORIES - Include 2X AAA BATTERIES that will allow you to use the pulse oximeter right out of the box and a LANYARD for convenience. Comes with 12 months WARRANTY and USA based technical phone support.