... moisture productsFeatures:with gauges,monitors,power supplies,circuit boads all in one body,small size,light,fast testing,simple operation,high ... (water content) Operating voltage: DC 15V (10V ~ 20V battery one piece) Using Conditions : The test object environment temperature 0 ~ 40 ... the measurement switch, when the LED not light, meet all the requirements shows it is properly can be use.Measurement ...