As the name suggests, the 5-Second Test involves showing users a single content page for a quick 5 seconds to gather their initial impressions. Five seconds may not seem like a lot of time, but users make important judgments in the first moments they visit a page. This technique unveils how those judgments turn out, giving the team insight into some essential information about the page. Using this technique, we’ve found the information we’ve gathered essential for making huge improvements to our clients’ sites.

5-Second Tests: Measuring Your Site’s Content Pages

If you want to use a tool for it, have a look at http://www.fivesecondtest.com/