Try to request a copy from the manufacturer.
Here are the contact details.

Postal address:
The Physician's Resource for Medical Equipment, Inc.
306 Country Club Drive
Mountain Top, PA 18707

Telephone:
Toll Free: 1-800-866-6689
Local: 570-868-6958
Fax: 570-868-6551

Electronic mail: [email protected]

Hope this will help you.

I could not find an online manual anywhere for this model EKG. I imagine if you go into the menu, it should be in those preferences just flip through those settings in the menu. If you unplug the device for 10 minutes does it not reset itself or is the information stored? also try looking in the back for a reset button only accessible with a pen inside a tiny hole.

Please be more specific

Here is a link to your manual. Looks like setup starts on page 50.

Hope this helps (my head hurts from just looking at it.)

Please let me know if it's not what you need.