The following link discusses the same experiment and has more specifics (does not discuss mass only in terms grains of rice or eyelashes - TL;DR 92mg). It also

The following link discusses the same experiment and has more specifics (does not discuss mass only in terms grains of rice or eyelashes - TL;DR 92mg). It also includes a clearer discussion of how well the results match Newton's equation (F=Gm1m2/r^2) vs the uncertainty of the experimental setup (TL;DR - this was inconclusive). https://physicsworld.com/a/physicists-measure-smallest-gravitational-field-yet/ https://physicsworld.com/a/physicists-measure-smallest-gravi...