product spec. *in-out door max-min thermometer with hygrometer *lcd display size:54.5x56.5mm *se-lectable °c or of display by slide switch *temperature range: indoor: -10°c ~50°c(14°f ~122°f) *max-min memory function *use 1x1.5 volt aaa battery with a meter waterproof sensor wire *humidity range:25%rh~98%rh 温度测量范围 室内: -10°c ~50°c(14°f ~122°f) 湿度测量范围:25%rh~98%rh 准确度: ±1°c ±5%rh 外观尺寸:12.5x7x1.92cm 液晶尺寸:54.5x56.5mm