Why does it matter? I’m in equipment design (engineering), and I’m available for hire to anyone who can see value in competent design, good communication, and concise project management.
Are you hiring? P.S. I have visible tattoos.
Because I think your experience would be different in a different field and (likely) location. Try making it to partner of a law or accounting firm, or one of various customer-facing fields where visible tattoos would, yes, be more likely problematic.
Equipment design is in manufacturing and generally a back-office sort of job. Quite different.