Can I trigger field updates when a counter is 1 Greater than predecessor

Can I trigger field updates when a counter is 1 Greater than predecessor

I'm wanting to datestamp each update to a counter Number field in an associated Date field. 
In making the workflow rule, I chose the counter (a Number field) that increased by 1 each time 
a work event occurs.
My logic options are =, !=, <, <=, >, >=, between, not between, is empty, is not empty.  BUT the value field has to be SPECIFIC. 
There's not an stock expression in this Condition type for "> than Predecessor".  

Am I missing an obvious function? 
Is there a work-around so that I can date stamp the visit counter field each time there's a new visit. 

THANKS<