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…