Ipad user agent strings
Here it is:
Mozilla/5.0 (iPad; U; CPU OS 3_2 like Mac OS X; en-us) AppleWebKit/531.21.10 (KHTML, like Gecko) Version/4.0.4 Mobile/7B334b Safari/531.21.10
You can test how you page looks like in Apple IPad by using safari browser and changing it from Safari to IPad.
Google analytics also providing report to see what mobile devices your visitors used.