... preset time, step control. 2011---HC series Expert Timer for Electrical life test(Laboratory)HH8 series, 48*96*80mm,single line 4 digits ... displayHH4series, 48*48*80mm,dual line 4 digits displayHH8 series, 48*96*80mm,dual line 6 digits displayHigh precision, ... Products available: Timing control by AC volt or current directly for equipment start/work life measurement,loop output within preset time ...