Maxaud

This plugin allows you to define different CSS rules that get loaded into the page’s for specific devices.
Includes checks for 18 different tablet options and 13 different phone options.
This can be useful if you need to target specific phones or tablets to make CSS changes or show certain advertisements for certain devices.
For more options or if you feel like donating, check out the <a href="http://codecanyon.net/item/mobile-css-pro/3182318/" title="Mobile CSS Pro" rel="nofollow ugc">PRO version of Mobile CSS</a> that is available for purchase.

Mobile CSS

Allows you to define different CSS styles that get loaded for specific mobile devices.

Aftab Ali Muni

This plugin is used to add type of device (mobile, tablet, desktop) in body class of wordpress website. This class is used to add device specific CSS.

Add Device Type to Body Class

This plugin is used to add type of device (mobile, tablet, desktop) in body class of wordpress website. This class is used to add device specific CSS.

Mobile CSS vs Add Device Type to Body Class