I was diagnosed with COPD, and other lung diseases last year. My doctor told me that I need to use my inhaler two times each day along with other medications. He would always check my oxygen rate and pulse with a finger pulse oximeter every time I had an appointment with him. He said my condition has began getting much worse and I may need to begin being on oxygen within the next few months. I never know if I should go to the hospital emergency room, as he told me to do so if my oxygen was at a dangerous level. Instead of paying to go to the hospital, or my doctor, when having problems breathing, I decided to purchase a finger pulse oximeter to use at home. It has really saved me many times of going to the hospital. When I was having problems breathing, I never knew if I should be seen by a doctor or not. Now that I use my finger pulse oximeter at home, it has saved me lots of money on hospital and doctor bills and also warned me to get the proper medical treatment soon, during other times, which may have saved my life. I had wanted to purchase one of these for a long time, but always thought they costs lots of money, or did not sell them to anyone but someone in the medical field. When finding out how I could get one at a very reasonable price, and purchased one, I feel that a finger pulse oximeter was the best medical device I ever invested in. It also caused me peace of mind during difficult breathing times, too.