Algodoo

Now it's ultimate probe device.

Precision, all-in-one metering (position, velocity, angle, angular velocity and rpm).
Working frequency > 50Hz

Once loaded and sim running, phunlet automatically creates following variables:

scene.my.k1pos, scene.my.k1vel, scene.my.k1angle, scene.my.k1angvel, scene.my.k1rpm

You should fix phunlet or double hinge (better) on the edge and all data will be measured at phunlet centre.