Proper tattoo ink depth is crucial to having dark consistent line work and vibrant colors. There are many methods to help a new artist develop the proper needle / ink depth technique. Using the Neo Needle / Ink Depth Tool takes the guess work out. You simply place the tip near the freshly tattoo’d area. Adjust the settings and press the button. The light will illuminate the skin around the freshly tattoo’d area. If you can see light coming up through the tattoo, you did not tattoo the ink deep enough.