Here are a couple of free tools that will check the SERP for a list of target keywords at once, note this generates a lot of Google queries and will cause results to stop and a capcha request to begin, unless you cycle through IP proxy accounts. Use smaller word batches perhaps 5 or 10 max to avoid Google locking you out for a period of time.
The Rank Checker plugin for the Firefox browser is one example tool.
Another tool is the limited free trial version of the SEO Power Suit, this tool is available for multiple operating systems.
http://www.link-assistant.com/rank-track...
These tools report the exact position not just the page the result appears in.
SERPs means "Search Engine Result Pages" which we can see after search any items by keyword in a Search Engine.