Can I ground balance the Garrett Ace 400? David Bachert April 29, 2021 11:36 Updated Question: Can I ground balance the Garrett ACE 400 Metal Detector? Answer: No. The ground balance is fixed and set at the factory. Relevant to: Garrett ACE 400 Metal Detector Related articles How do I factory reset my Garrett AT Max? Comments 0 comments Please sign in to leave a comment.