It is important to choose the appropriate sensor for the participant’s finger size. The pediatric sensor will be used for children, and many women will also have fingers small enough to use the pediatric sensor. In a moment we will discuss how to assess whether women should use the pediatric or adult sensor. Children may be measured if their fingers or thumbs are long enough to reach the end of the sensor and fit snugly against the sides of the sensor.

Each sensor comes with a Slender Digit Gauge that will help you determine if it is the appropriate size.

To measure a participant’s finger using the slender digit gauge, slide the gauge circle onto the finger as shown in the image. If the gauge circle stops at any point of the nail bed before the cuticle, the sensor can be used on that finger. If the gauge slides past the cuticle, the digit is too slender for that sensor. You will need to choose another sensor or use the pediatric sensor. If the participant’s fingers are too small for the pediatric sensor, you cannot use the Pronto and will need to do a finger poke.