... loop output within preset time, step control. 2011---HC series Expert Timer for Electrical life test(Laboratory)HH8 series, 48*96*80mm ... /pulse or level controng timng,etc.. Products available: Timing control by AC volt or current directly for equipment start/work ... life measurement,loop output within preset time, step control;Segments independent timing control2,Dual 4/6 digit display, range ...