Pistol Pete...what's your real name?
Anyhow....since nobody has responded due to the lack of nomenclature I'm sure....hehe. I will!
http://shop.ebay.com/i.html?_nkw=alt...286.m270.l1313
This is called an "Altimeter" and all us silly folk use one for relative barometer..We set it to 29.92 standard and it will give u a relative barometer reading in feet..God I hope this helps...We hire the handicapped at work...its always fun to watch them work... Have a beautiful day Pistol and please press down on that horizontal rectangle thing on the left side of the vertical rectangle thing after you make your next quartermile pass...
Yours truly...smart assist...