Are annulled gravitational fields detectable?

[synch]

There is a classic electrostatic example of two slabs of opposite charge in parallel, and the electric field and so on.
I am wondering about the gravitational analogue with two equal slabs of mass. The intuitive view to me, is/was that there will be a gravitational field between the two slabs. However the net effect on a test mass at a point between the two will be zero ...so is the gravitation there detectable ? ( away from edge effects and so on ) .
I assumed the field would be uniform but now I wonder if that is just a combo of two expanding fields (?)

 

[Baluncore]

Maybe one of the Lagrange points, L1 ?
https://en.wikipedia.org/wiki/Lagrange_point#L1_point

There is also the Cavendish Experiment.
https://en.wikipedia.org/wiki/Cavendish_experiment

 

[renormalize]

I am wondering about the gravitational analogue with two equal slabs of mass. The intuitive view to me, is/was that there will be a gravitational field between the two slabs. However the net effect on a test mass at a point between the two will be zero ...so is the gravitation there detectable ?

Are you asking about Newton's gravity or Einstein's (general relativity)?

 

[Nugatory]

The intuitive view to me, is/was that there will be a gravitational field between the two slabs.

Your intuition is mistaken here. Away from the edge effects and if the two slabs are identical the field is zero. That’s just another way of saying

However the net effect on a test mass at a point between the two will be zero