Oil level changes depending on scooter position

Ive noticed the oil level can be different depending on scooter position- on centre stand with front tyre on the ground, on centre stand with rear tyre on the ground and especially if no stand with both tyres on the ground.
Can anyone tell me how to position scooter to get most accurate oil level reading, personally I think no centre stand with both tyres on the ground would be best bit awkward but seems most logical

 

Both wheels best, but front wheel on ground would do for me, not a lot of difference really !

 

I use a piece of wood under the rear wheel to get the same height as front wheel off ground on center stand.
When off stand you have to try and balance scoot keeping upright while checking oil level and for me that is hard to do.
Hope this gives you an idea.

 

Thanks for replys will try piece of wood