1.Non- contact-type to measure earth resistance, safe and fast. 2.Date Hold 3.Manual/Auto ... alarm symbol, By AL key to open, close, setLCD4-digital LCD, 47×28.5mm in lengthBoot-strapSelf-testing in 0 ... 1KHzThe Measured Current Frequency50/60Hz AutomatismStorable Measurement Data99groupsSetting Range of Resistance Alarm Critical Value1-199 ΩProtection LevelDouble insulationStructural FeatureIn the ...