How can I find out my body fat percentage for sure?

Anonymous
I had an old body analysts scale that told me my body fat percentage was 15.5% I got a new scale that said my body fat percentage was 9.7% which seems like a big difference.

I did use some online body fat calculators that said anywhere from 9% to 15%.

For reference my weight is 150lbs.
My waist circumference is 30 inches.
My wrist circumference is 6 inches.
My neck circumference is 13 inches.
And my hip circumference is 35 inches.

I don’t think my body fat can be around 9% since as I understand you should see your abs at that point which I can not.
How can I find out my body fat percentage for sure?
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