# 2.4.2 Q value The Q value represents the received signal quality and can be regarded as an indicator of signal-to-noise ratio (SNR). The value is displayed at the lower right of the display interface. The value ranges between 0 and 100%. Under normal conditions, the Q value should be > 60%. The higher the Q value, the better the signal quality, and the more reliable the measured value. A Q value of less than 10% will not be measured. Try the following solutions: ● Sometimes the RSSI value is high, but a low Q value may be displayed due to slight distance, angle, or other errors in the probe. If the Q value is low, try to adjust the distance and angle of the probe slightly. ● If the pipe surface is rough, smooth it and confirm that the probe can completely adhere to the pipe surface with no gaps. ● If the coating provided by the coupling agent isn’t smooth, recoat to provide a smooth surface. ● If the pipe surface has impurities, dirt, or grime, the probe should be moved to another location. ● If surrounding equipment causes electromagnetic interference, change the installation location or strengthen shielding. ● If the fluid flow field is unstable, change the installation location. ● If the pipe diameter is too large, set up the probe in the Z​ configuration. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.lorric.com/qr/fu-tx310-ultrasonic-flowmeter-manual-en-v3/2-installation-method/2.4-installation-check/2.4.2-q-value.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.