Online monitoring of grounding resistance, grounding voltage. 1. Model No.: ETCR2900B 2. Ground resistance ：0.01Ω～2000Ω 3. Communication method ：RS485 or GPRS 4. Monitoring Interval Time :Setting range of automatic monitoring interval time :1-999 h 5. Measurement rate：over 10000 times 6. Power Supply : Standard：12V - 24V (±1VDC)、400mA Max（provided externally）
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