... for field measurement, adopting the latest digital and micro-processing technology, 3-pole or 2-pole method for earth resistance ... earth ground resistance measurement.7.Display Mode 4-digital super-large LCD display, blue screen backlight,8.Measuring Indication ... Overflow Display,Alarm Function.17. Electromagnetic Features IEC61010-4-3,Wireless frequency electromagnetic field≤1V/m 18.Protection Type ...