Purchased a "Oximetro de Pulso para Dedo" for $675 pesos from Farmarica Guadalajara. My wife brought it home to me and when I installed the (2)-AAA batteries (not included), the top of the unit popped off. The white on/off button fell out and bounced I don't know where. It is made of plastic and when I snapped the last battery in place, I apparently broke two of the tabs holding the top on. Pressing the contact switch under where the button used to be did not turn the unit on. When I tried to return the unit less than 1.5 hours after it was purchased, they refused to refund or replace the unit.
I've included a picture of the unit. I would score it 0 / 5.