For technical reasons, the sensor controls are located very close together. Your finger only has to be slightly outside the desired sensor control for the control to register a different power level.
If you set a power level between 0 and 9 on the numerical display, the selected power level is not always recognized. For technical reasons, the sensor controls are located very close together. For example, if you want to select power level 5 but accidentally place your finger just to the side of the sensor control, power level 4 or 6 might be registered instead.
Instead of selecting the power level directly, try sliding your finger across the numerical display. For example, you can start at power level 0 and slide your finger back and forth until the desired power level is reached.
