How many digits is the serial number for the Garrett ATX? Shelby Richardson April 29, 2021 11:38 Updated Question: How many digits is the serial number for the Garrett ATX? Answer: 8 digits Relevant to: Garrett ATX Related articles How To Set a Garrett AT Max to Find Gold? What are some of the best batteries for a Garrett ATX? How do I get a military discount for Garrett? How to Quiet The Garrett AT Max How do I factory reset my Garrett AT Max? Comments 0 comments Please sign in to leave a comment.