Perfmon - memory alert - limit field unit of measurement?

Windows Server 2008 R2.

I want to setup an alert that writes to the event log when available memory is below1 gb.
What's the unit of measurement for the Limit field?  Is it always a percentage? If I put in 75, is that 75 percent?  Or does it depend on which counter your selecting?  
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Greg HejlConnect With a Mentor Principal ConsultantCommented:
deciphering technet documentation it appears to be dependent on the type of counter and what value it purports to represent.

as in % of committed bytes would be percentage

memory free MBytes would be memory in megabytes (ie 75 would equal 75 megabytes)
Greg HejlPrincipal ConsultantCommented:
if you believe you have an issue with memory usage I would use PRTG network monitor instead.

it will give you graphs and logging - there's a free version available @
WestezAuthor Commented:
I"m asking what the unit of measurement is for the Limit field with regards to the Memory counters.
Would you know what that is?  

Thanks for the suggestion on PRTG.
WestezAuthor Commented:
Thanks Greg, I've got it working just the way I need it to.
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