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JD300, see if you can find a level where ± 1° can be clearly identified as a minimum. 1° of unwanted cant will give 175mm of unintended windage offset for 10 metres of elevation correction, which is...

There was recent information on the issues resulting from canting a rifle here:
https://www.nzhuntingandshooting.co.nz/f32/rifle-canted-scope-level-61019/

If you (ideally) shoot with both eyes...

You may need to clarify as to whether you are wanting a level to help get the rotational orientation of the scope aligned with the rifle when setting it up, or if this is to identify cant when...