2000 counts max. display (HK588A & HK588B) 4000 counts max. display (HK588C & HK588D) 6000 counts max. display (HK588E) Overload protection for all ranges Built-in NCV (non-contact voltage detection) function Low pass filter function (HK588A & HK588B) Inrush current function (HK588E) Built-in bright flashlight LCD backlight