Zabbix web monitoring

[Nathan-plug]

Question for the Zabbix users,

I am using weewx with a VangatePro2 weather station and need to make 
sure the page displaying the weather is being refreshed.  Weewx works by 
talking to the VantagePro weather station and then outputs html based on 
a template file every 60 seconds.  I had a scenario where weewx was 
running but the weather station was not talking so being that there was 
new no input, weewx didn't refresh the page.
I created a web scenario in Zabbix to monitor the site but it only 
triggers if i get a response other than 200 and doesn't tell me if the 
info on the page is old.  I'm not sure what I need to do to make sure 
the page is being refreshed.

Thanks

Nathan