Please note that bright light may not allow the Pronto to get a reading. If the sensor shield does not completely cover the finger due to finger size, cover the sensor with a hand or other shield.

You can use the Pronto on sites with nail polish and/or acrylic nails. Some types of nail polish may interfere with the test and prevent a reading, but it is advised to attempt tests with nail polish. Warnings in the Pronto Operator's Manual alert users that nail polish and acrylics can cause the test to fail due to low SIQ, this results in a test incomplete message. If the Pronto displays a result from a site with nail polish, the result is as accurate as if the site had no nail polish. If a reading fails, it does not reduce the number of tests left on the sensor.