... /GWJ-2/GWJ-3Product description:GWJ series Grain Hardness Meter measures hardness of granular good such as ... life.3. Has two types: Pointer and Digital LED. Technical parameter: ModelGWJ-3Test range30kgDisplayDigital LEDStressAutomaticMaximum ... one-button measure, portable use , measure continuously, LED digital display, uniform pressure, automatic measure, automatic display, automatic ...