Đồng hồ đo điện trở cách điện Kyoritsu 3121A Model 3121A DC test voltage 2500V Measuring ranges (automatic change) 2GΩ/100GΩ (Auto-ranging) First effective measuring ranges 0.1 ~ 50GΩ Accuracy |± 5% rdg Other ranges accuracy |±10% rdg or 0.5% of scale length Withstand voltage 5000V AC for 1 minute Power source R6 (AA) (1.5V) × 8 Dimensions 200 (L) × 140 (W) × 80 (D) mm Weight approx. 1kg Accessories 7165A (Line probe) (3m) 7224A (Earth cord) (1.5m) 7225A (Guard code) (1.5m) 9158 (Hard case) R6 (AA) × 8 Instruction manual Calibration Certificate Optional 7168A (Line probe with aligator clip) 8019 (Hook type prod) 8324 (Adaptor for recorder) 7253 (Longer Line probe with alligator clip) (15m