Visualize dashboard on other screens

It looks like @Bry has you pointed in the right direction. The two most common approaches for designing for a specific device size are to:

  1. Adjust the width of your PC browser to roughly match the target device
  2. Use the Device Toolbar in Google Chrome to simulate the tablet exactly

Also keep in mind that if Chrome’s device emulator doesn’t already have your device listed, you would need to manually add it. And one thing that’s a bit tricky is that the effective screen resolution on many modern devices is often different than the resolution listed in their specs.