I had seen the McKesson finger pulse oximeter at my doctorĂ¢Â€Â™s office and loved the thing. I have serious heart and breathing issues, and constantly have to check both to see if my medication are working correctly. I tried several places on the internet, and the brand name was the same, but the price was very low for this quality item if it was like the one I had seen. I found Cascade, and they seem reputable, and the meter seemed in the price range that it should be. I fear getting a knock off, and it wouldnĂ¢Â€Â™t be the first time I got one. Anyway, the meter has been excellent, and Cascade shipped it in two days, and sent an email asking if I was satisfied with my purchase. I highly recommend them and the meter.