Using Adobe Ink with Adobe Photoshop Sketch
You can use your fingers to sketch with all of the drawing tools in Adobe Photoshop Sketch. However, the Adobe Ink pen tool provides greater control and precision when working in Sketch. Adobe Ink is a gracefully designed fine-tip, pressure-sensitive pen for the iPad and CC. To use Adobe Ink, you'll need an iPad (fourth generation), iPad Air, iPad Mini, iPad Mini with Retina display, iPad Mini 3, or iPad Air 2. For this article, I used an iPad Air 2.
To connect Adobe Ink, begin by opening a project in Adobe Photoshop Sketch. In the menu bar at the top of the screen, tap the Pen icon to open its dialog, as shown in Figure 6. When the dialog appears, press and hold Ink's button until the LED on the top of the pen cycles through the color spectrum. Next, press and hold the pen tip to the pen target in the Pen dialog until the pen connects.
Figure 6 Press your Ink tool to the circular target and hold until the pen connects.