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Easy Home Areta Fingertips pulse Oximeter with dual color is a HighQuality pulse Oximeter. It has very high accuracy rating . OLED display in 4 direction and 8. It measures and monitors blood oxygen saturation levels and pulse rate in seconds with high accuracy , show the reading In numbers as well as waveforms and bar graph . Smart display to any direction simple by just pushing one button . It also remembers the last reading , so I can compare . This is a really great pulse and I'm very happy with it . https://www.amazon.com/Areta-Fingertip-Oximeter-Dual-color-Directions/dp/B00TP1NEGM?ie=UTF8&keywords=pulse%20oximeter%20fingertip&qid=1464198894&ref_=sr_1_64_a_it&sr=8-64