Quantitative measurement of forces, without force probes and spring scales is a bit difficult. A dimagnetic material produces a magnetic field that opposes an external field. A paramagnetic materia, on the other hand, produces a magnetic field that increases an external field. Dimagnetism and paramagnetism are induced when an object is placed in a magnetic field. Without an external field, the effects are not seen.
Ferromagnetic materials are natural producers of magnetic fields like iron, cobalt, and nickel.
The reality of dimagnetism is that it usually takes very strong external fields to produce the effect. Dimagnetic levitation is not easy to produce in student labs because of material and set-up considerations. Students are asked to discover if intervening materials 'affect' the interaction of magnets. Whether students observe both screening and enhancing effects is a function of the care with which students make observations and the types of materials they have available. A metal coffee or juice can lid will enhance local fields by contributing to them.