Standalone extractor fan humidistats - do they exist?

[c128]

I'm considering shifting from my bathroom extractor fan (inline duct) being activated via a double-pole pull switch to a ceiling mounted humidistat. Do standalone ceiling mounted humidistat's exist for this sort of thing, or are they all integrated/supplied with fans?

I've Googled about and searched on here, but no results...which makes me think either they aren't available or (more likely) I'm not searching for quite the right thing.

 

[daytona]

they are freely available mate,with pullcord without etc all types.try vent axia,they do loads.

have a look at the airflow icon range too.

 

[daytona]

or manrose if you want a cack,sorry, cheap one