Place it on the side of your windpipe, and wen u count ,.. count the number of beats in 15 seconds..like feel the bone of ur jaw line.. and push in. the when u feel a beat there u go.. sometimes u may have to hold your breath to focus on the beat 
 
        
        
        
Answer:
Examples are ultrasound and MRI machines, PET and CT scanners, and x-ray machines.
Explanation:
I didn't understand the question all that well
 
        
             
        
        
        
There are 3 main research types in psychology