We have two such devices in use to measure in the House at various points the humidity and then, if necessary, to take action (increasing the humidity in winter means humidifier Solis 970.20 Ultrasonic Humidifier / lowering the humidity in the summer, especially in the basement using dehumidifiers) , For accuracy, I can say that show both units in roughly the same humidity and this also with the display of the humidifier in such matches (my conclusion:.. Are the inaccuracy of the device is expected in the range of a few, max 5% A device We already have two years of service and we have the first batteries in it, but now slowly become weak.
