HEAT INSULATION FEATURES Microprocessor-controlled. Four insulation test voltages. Insulation resistance; auto ranging on all ranges. Bargraph indicates test voltage; rise and decay can be observed during tests. Visual and audible warning if external voltage is present. EnerSave™ feature to extend battery life. 2 Lines × 16 characters large LCD. Low battery consumption. Low battery indicator. Overload protection. Auto-off. Show test time duration (up to 99.9s) for easy comparison. EEPROM calibration. Built-in carry case and test leads in separate pouch.   Specification Test Voltage (DC V) 0.5kV/1kV/2.5kV/5kV Measuring Ranges (Auto-Ranges) 0-25GΩ / 0-50GΩ / 0-125GΩ / 0-250GΩ Accuracy 0-50GΩ : ±3% rdg 50-250GΩ : ±5% rdg Dimensions 170(L) × 120(W) × 95(D)mm Weight (Included Battery) Approx. 930g Power Source 1.5V(AA) × 8 Safety Standard EN 61010-1 EN 61326-1