Worked in ER for more than 10 yrs. Had a kardia mobile which was excellent. I was able to instantly able to see a large clear screen of my ekg and determine arrythmias. Print outs were hospital quality, easily measured. Purchased the sono health because of the ability to see more lead views. Disappointing. The screen is to small to see anything relevant. You Must use a large monitor computer app to see your ekg. The print out resolution is so poor it reminds me of the old dot matrix printers set to economy mode. Would help if the sono would transmit directly to your mobile phone so the ekg could be seen on a larger screen in real time.