Elite crono fluid resistance setting

Unsure what to set the resistance as. The Elite crono fluid has 5 resistance settings - the Zwift information for this trainer simply has a - next to it, whereas all of the other elite mag trainers have either resistance setting 3 or 4 next the name. Should add that the other elite fluid trainers also have a -, rather than a number. I have left the setting on 1 - wondered if Zwift has any suggestions?

That is strange I haven’t seen a fluid trainer with resistance setting.

Is it this one?

Ahhhh ok - perhaps yes… purchased from eBay without any docs. Didn’t realise was the hydro-mag