910
The internet wouldn't allow this
(startrek.website)
People tweeting stuff. We allow tweets from anyone.
RULES:
What's the variation? Does it ever get to 9.9 or 9.7? It's a negligible "nope" for people weighing themselves :D
We are talking about engieneering use. Though good scales can be callibrated.
You can look up gravity survey maps but it's not a huge variation in the habitable altitudes