Ever since DH had his heart attack and subsequently getting a pace maker, checking his heart rate is really important.   We have a large desk size machine that checks his heart rate; but it isn’t anything we can travel with or take with us when we are out and about.   We are SO thrilled with the extremely portable and VERY accurate Acc U Rate SM-310 an oximeter that checks both your heart rate (pulse) and your blood Oxygen levels. The unit itself is small, lightweight and very easy to use. Just slip it on your fingertip and turn it on. Within about ten seconds you’ll see your current heart rate and blood oxygen saturation percentage on the large, bright, crystal clear, high contrast OLED display. The finger well has a smooth, almost silky feel and its designed to effortlessly expand to work well with any size finger. There is just enough spring tension to hold it comfortably and securely on your finger without any pain or pinching. Remove your finger and within about ten seconds the SM-310 will power down automatically. It could not be easier. The Acc U Rate® SM-310 is AWESOME!! Small, very portable and super easy to operate. Place…