Sort of occasionally works

Have replayed tutorial multiple times with little effect. After persevering 25 or more times have measured pulse twice. Have tried all sorts of index finger placements, with the rear and front camera with equally dismal results. Have attempted to take pulse only while sitting and frozen in spot. Tried holding finger hard, softly and then so softly iPhone was slipping from my grasp. Good luck making this thing work.

Roof dudes about Cardiograph Classic, v2.6.1