Some shops mark their cylinders in 4 parts, (90 degrees apart) at each end of the cylinder and get 8 readings per cylinder. Unfortunately, not many will take the time to do this.So be cautious of the readings that you are given. Qualify them if you can.
Vasovagal syncope (also called cardioneurogenic syncope) is a condition in which temporary loss of consciousness is caused by a neurological reflex that produces either sudden dilation of the blood vessels in the legs, or a very slow heart rate (bradycardia), or both.
Read about vasovagal syncope, which is a cause of fainting or passing out. If you faint at the sight of blood, needles, or certain sights and sounds, find out why.