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Pwnie Express is a pretty awesome company, https://www.pwnieexpress.com/, you have probably heard of their Pwn Plug even if you don't recognize the company's name.
They have a new Pen Testing phone out called: Pwn Phone 2014
Product link https://www.pwnieexpress.com/penetration-testing-vulnerability-assessment-products/sensors/pwn-phone-2014-penetration-testing-phone/
They aren't cheap, but Pwnie Express also provides free downloads for the entire software suite they use in their products.
It usually take a little time for new product's software to be added, but they already have software for 2014 Pwn Pad, Nexus 7 based, available.
Download [Updated link 1/13/15] https://www.pwnieexpress.com/community/ if you want to use your existing Nexus 7, they should have the Nexus 5 download available in near future as well.
The downloads for DIY are listed under "Community Editions & Legacy Product Downloads"
If I can find the time this week, I will also track down current hardware accessories they offer, & update this post or make post dealing with accessories.
Meanwhile you can view hardware accessories I listed for the 2013 Pwn Pad http://cliffsesportcorner.blogspot.com/2013/02/pen-testing-pwn-pad-by-pwnie-express.html.
Probably newer options available for some of those products, but those should work.
Just click following labels for more blog posts on Pwnie Express or Pen Testing, labels can be found at bottom left of every blog post, easy way to find similar or related content.
Select labels can also be found in label cloud at left side of Blog.
, I am including these links so people can check specs of included accessories.