Q2012A Kibble balance realizes the kilogram by balancing weight against electromagnetic force measured with quantum electrical standards tied to the fixed value of Planck's constant.
The balance works in two linked modes. One matches a mass's weight with magnetic force on a current-carrying coil; the other moves the coil to calibrate the same system through induced voltage. Quantum standards make the electrical measurements traceable to Planck's constant, whose value was fixed in the 2019 SI. A suitably equipped metrology institute can now realize mass from a reproducible recipe instead of comparing everything to one ageing object.