Jonathan,
Look at a marine store for a clinometer that is used to measure angle of heel in
a sailboat. They run about $15 US.
Or in camping trailers (caravans) there usually is a level like you want to
adjust
the camper to the pitch of the campsite. They also are about $15 US.
I assuming that you don't need a "certified" slip skid balance ball.
Here's a link to a marine supplier in the US :
http://search.defender.com/?expression=inclinometer&x=9&y=5
Hope this helps.
Jim & Heather
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http://forums.matronics.com/viewtopic.php?p=413855#413855
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