Digital Hygrometer Round - by Metro Fulfillment House
Metro Round Digital Hygrometer with Adjustment option - Know that your digital hygrometer is reading accurately. The Metro Digital Hygrometer is adjustable after calibration. A click of the adjustment knob changes the humidity display (+ / -) by 1-percent. Includes instructions and simple calibration method. Calibration can be done with water and 2 basic household items, full details included with the unit.