Yes the espressoDisplay will work with your iPad. You will require an additional HDMI Cable and Power source (such as a phone charger or power-bank) for your espressoDisplay.
If your iPad does have USB-C then you will not require a HDMI Cable.
If your iPad does not have USB-C you may also require the Apple AV Adapter.
Please note that when connecting to an iPad you will receive a screen mirror of whats on your iPad. At this stage touch is not available on the espressoDisplay when using an iPad.