Sometimes I see an asterisk (*) after my Turbidity readings. What does this mean?

FAQ - Turbidity: Self-Cleaning

1. How often should I change the wiper?
2. What solution should I use to calibrate Turbidity?
3. Q: Sometimes I see an asterisk (*) after my Turbidity readings. What does this mean? A: The asterisk (*) appears if the Turbidity readings are outside the range at which you calibrated the sensor. Although the sensor is exceptionally linear, even outside the calibration, it is important that the user understand that these readings are outside their calibration range.