How can developers ensure digital credential displays are perfectly calibrated for end-users?

When integrating automated certification workflows, the final visual presentation of a digital badge or certificate is crucial for maintaining brand integrity. Have you ever encountered issues where subtle monitor defects, like backlight bleed or uneven contrast, caused your designs to look inconsistent across different hardware? Do you believe that running a quick diagnostic with a Black Screen Tool during the UI/UX testing phase is a practical way to ensure your credential templates remain visually flawless? What other specific display verification steps do you recommend to colleagues to guarantee that the recipient's viewing experience matches your original design intent?