Heath Consultants Detecto-Pak 4 (DP) - Manual (Page 43)

II
The following suggestions will expedite the repair of your instrument:
• Package carefully, using the original shipping carton if available,
and return all components.
• Specify your complete shipping and billing addresses.
• Specify the instrument or product name, model number, and
serial numbers on all correspondence.
• Include a brief description of the problem you are experiencing
and specify the person to be contacted for information.