- 6688B have high performance, and safe configuration and improved electrocircuit. - It is one new item which has more fully function, higher precision, and easier operation. - It's also one quakeproof, dustproof and dampproof tester and can fit work environment of outdoor. - The resistance 200G, the tester also can measure ting. -This Tester apply for all kinds or electric equipment and insulation materials such as transformer, electromotor, cable, switch, appliance, etc.