审稿人评语
General comments:
The paper describes two simple and inexpensive non-contact methods used to acquire data in an undergraduate laboratory set-up. The results obtained for a torsion pendulum experiment are used to illustrate both data acquisition methods. In my opinion, the paper will be of interest to teachers involved in the development of experiment at undergraduate level, as it demonstrates the use of Hall sensors and the optical mouse as valuable and cost-effective motion sensors. The paper is within the scope of the European Journal of Physics, and the material presented is likely to be used by readers of the journal not only in the context of the specific experimental set-up described in the manuscript, but also in other experiments. The explanations and descriptions provided are considered to be sufficient, and the length of the paper is appropriate to the material discussed, although the conclusions should be shortened considerably to emphasize the main advantages of the methods proposed.
