One of the smallest handheld oximeters available, TuffSat is the ideal spot-check solution for hospital, home care, transport, and EMS. This handheld offers excellent visibility in all light conditions with its large, backlit LCD display easy-to-read numerics. Increased validity of Sp02 and pulse rate data using PIr (Perfusion Index measurement) allowing the rapid location of the sensor site with the strongest pulse signal by comparing the perfusion index at different sensor sites.