Used to mass mark fin rays, scales, otoliths, and other calcified fish tissues through immersion. Marks left on these tissues remain invisible to the naked eye and can only be viewed with the use of a special SE-MARK detector. Contact us for pricing and assistance at Syndel’s USA office at (800) 283-5292, or Syndel’s Canadian Office at (800) 663-2282.  For International inquiries email sales@syndel.com.