The Analog scale for insulation resistance measurement is logarithmic in nature which gives the dynamic performance of an analog insulation tester. The Analog scale is linear for low ohm and voltage measurement.Insulation Resistance measurement from 10kW to 1999MW (2GW),Selectable Test Voltages 50V/100V/250V/500V/1000V, Low Resistance measurement 0.01W to 99.9W, Voltage measurement>25V to 600V AC/DC, Optional: Connector Jack for External Mains Adapter, 230VAC/9VDC, User Selectable Backlit Display, Storage of Min/Max values, Storage memory for last 50 readings, Live circuit Detection>25V irrespective of function selected, Automatic Discharge of Capacitive circuits after test performed, Preselectable limit checks (Go/No Go option) for MW, Preselectable measurement time for Insulation Resistance Lead Resistance Null facility, Stop Watch function, Blown Fuse Indication, Auto power off, Low Battery Indication, Power supply Battery 6 X 1.5 V Cells, IEC LR6