Tank meter

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hi working on project measure level of liquid in tank there.

tank 10 meters high.
precision: presicion order of tens of cm.

i have 2 options:

-sensor ultrasonico >> problem little arduino reach 3 meters (hc-sr04) more powerful sensor exists? of more 3 meters

-boya >> use buoy floating in water , depending on height of reading me or another. problem meeting buoys on / off, if there not kind of buoy tells me altitude of position, or sensor can tell me altitude reference.

any other ideas, sensor?
other idea?

yes, there ultrasonic sensors greater range.  did bothered google "10m ultrasonic sensor" ?


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