Product review (4 stars): Can change from F to C. 1 AAA alkaline battery. No backlightb for night use
Nice hygrometer gives humidity and temperatures. The temperature unit can be changed from Celcius to Farenheit using a small button behind. Has a magnet to the back so that it can be attached to a metal surface. It also records the highs and lows for both temp and hum. One improvement to be made is to add a backlight for the screen using a button so that you can see the screen in the dark just as how a watch operates. This hygrometer uses 1 AAA battery 1.5V which is alkaline, rechargeable is 1.2V.