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One major thing to note is that your tank has very narrow walls and this is going to contribute to quite a bit of disturbance. Firstly the field of view is quite wide and is likely to hit the tank walls, you can correct this with some kind of optical lens which is capable for mmWave Radar. Secondly because of the narrow walls then vibration is going to be detrimental to your measurements.
Another factor to consider is the mounting of your EVM. Your EVM does not appear fixed which is going to contribute greatly toward precision of your measurements. I'd highly recommend find a way to fix the EVM to the tank you are using.
1. Unfortunately I cannot recommend a specific optical lens.
2. We recommend using a tank with a width of at least 1m and preferably more for more accurate results.
3. The issue with this setup is that you are going to be moving the position of the sensor relative to the liquid which is where we have the inconsistency. If there is a way to mount the sensor mechanically such that it is in the same position you will be able to obtain much more precise results.