For accuracy of the measurement, in particular the individual device can be in advance of course anything reliable to say, but my experience with a dozen hygrometer are that this battery-less hair hygrometer to measure the humidity at least as well suited appear as the electronics in the same price class. Deviations of 5% more or less (relative) humidity in the display of different devices have to tolereieren or better schedule. It is advisable to read this manual before setting up again.
Benefits: - Good readability even from a distance - At least one calibration point can be easily controlled - No batteries required
