How to measure out exactly 9.7 quarts?

So I'm changing my transmission fluid this weekend and the refill chart for my truck (1991 Ford Ranger) says 9.7 Qt. I have an old power steering fluid bottle that's 1 quart so I can do 9 full bottles of that, but the 0.7 part is what kinda confuses me. How could I get that exact amount? Whats the best way to go about doing that?

Thanks!

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