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Measuring Range: Electric Field: 1~1999V/m Magnetic Field: 0.01~19.99 Resolution: Electric Field: 1V/m; Magnetic Field: 0.01 Accuracy: Electric Field: ±10V/m; Magnetic Field: ±0.2 Alarm: Electric Field: 40V/m; Magnetic Field: 0.4μT Display: 3.5 Digital LCD Frequency Range: 5HZ - 3500mHZ Sampling Time: 0.4 Second Measuring Mode: Dual Mode Overload Alarm: 1 Appears On Screen Sound & Light Alarm Data Hold Backlight Auto Power Off Average & Peak Reading Low Battery Indication Operating Temperature: 0℃ - 50℃ Operating Humidity: Below 80% RH Power: 9V Battery(not included) Dimension: 63.6mm x 31mm x 25.8mm