Repeating measurement - focusing does not start immediately
The focusing of the image and thus the measurement of the test strip on the JBL PROSCAN COLORCARD does not start immediately after the 60 seconds have elapsed, and this gives you time to lift the smartphone and position it horizontally to the COLORCARD with the correct image section. If the measurement were to start immediately after the time expiry, the capture would have you lifting the smartphone slanted in front of your body. These distortions cause erroneous readings. Therefore, since app version 4.0, a 3-second delay has been added to help you achieve correct alignment and always capture correctly.
By tapping the display with your finger, the focusing can also be restarted manually after the 3 seconds. Repeating the measurement or "back" is prevented at this point, as otherwise incorrect measurement values will be obtained. The measurement must be taken within 10 seconds after the 60 seconds have elapsed. Otherwise the test strip is unusable. If this happens the test needs to be started again from the beginning with a new test strip.