Measuring Water Tank Level with a high Frequency Radar Level Transmitter

I'm just wanna know if the high frequency 26 GHz radar level transmitter can measure water levels? what's the difference between short wave and long wave? can I use the ultrasonic water level sensor instead of the radar level transmitter? If I select 26 GHz radar level transmitter, will it affect the measurement accuracy.

Thanks for your help!
 
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