story identification - Boy travels through time using a calculator

I read a book from the late 80's when I was 13 or 14 about a boy who travels through time using a calculator. I don't remember too much detail...but I do know that he was on the run from a bad guy who was chasing him and trying to take the calculator. The bad guy might have had a time traveling calculator as well because I remember him chasing him through time.

He got the calculator from a scientist and he was friends with the scientist's daughter. I know that both kids were teenagers, but I don't remember too much more than that.

I never got to finish the book...and for some odd reason, I really want to.

Answer

This might be Strange Attractors by William Sleator.

I haven't read it but a plot summary on Amazon says it's about, not time travel exactly, but moving between multiple timelines. Actually it sort of reminds me of Sliders. It was published in 1990, so it pre-dates Sliders.

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