You need a better choice of words here such as: There is 0 resistance in the closed state, open in the open state within the limits of my ohmmeter OR The float seems to act as a switch without excessive contact resistance.
e.g. I can't measure down to 0.001 ohms, but it looks like a "good switch".
"No resistance" can be interpreted as a superconductor where no means zero or "no resistance" can be interpreted as an OPEN.
Your OPEN would actually have insulation resistance involved with some switches. ZERO should not be used interchangeability with no.