I took this from Princess Drive lookout area with 300mm. I was there yesterday morning to hook up a hart rate monitor. I have to carry this 24 hours and take it back this morning around 9:15AM. There is a nothing wrong with me but just to record baseline. So, my doctor has something to compare if/when something was wrong. It's just for precaution due to my family history. To me, it's an interesting experience.