As the title says ...any suggestions ...the directions I got for Fat Tracker Calipers were very poor

As the title says ...any suggestions ...the directions I got for Fat Tracker Calipers were very poor

Hi, I've also recently bought these from bb.com.
There are some instructions here:
http://www.bodybuilding.com/store/acc/fattrack.html

But they seem a bit didgy. I get quite a large variation every time I make a measurement.
Lemme know how you get on.