SantaMedical SM-240 Finger Pulse Oximeter is an affordable and accurate way to check pulse rates and blood oxygen saturation levels. Self-adjusting finger clamp plus simple one-button design allows for easy operation. Small portable size makes it easy to handle and carry. Helpful for athletes and pilots to obtain quick and accurate oxygen saturation readings. Deluxe features include an easy to read bright color OLED display. Integrated SpO2 probe and processing display module plus Pulse Rate, bar graph and Plesthymograph wave that measure pulse strength. Auto power off.