Flexzion Digital Hygrometer Hygro Thermometer Humidity Temperature Meter Portable Pocket Pen Shape Tester Measurement Tool For Indoor Home Office Maximum and minimum reading memory Pen shape elegant and simple design Large and clear dual display. Fast reading update F, C temperature selection button with range 32-122F (0.0 to 50.0C) Ideal for heating, cooling, ventilation, greenhouse and other applications where temperature and humidity levels are critical