It’s Varies 3% all within seconds several times a minute, it’s off about 10% compared to other hygrometers. It just doesn’t seem like an accurate or stable reading
It is too sensitive to immediate changes. But one great feature is you can calibrate the humidity and temp. Hold the power button and up for temp, power button and down for humidity. Let go when its set where you want.
so the fan will ramp up and down, when it ramps up the humidity will drop and when it slows down the humidity will rise up again, it is because your plants are creating humidity through transpiration
It is too sensitive to immediate changes. But one great feature is you can calibrate the humidity and temp. Hold the power button and up for temp, power button and doen for humidity. Let go when its set where you want.