The DY4100 digital grounding resistance meter is a high-resistance meg-ohm instrument for professional inspection and testing. It is widely used across multiple industries including power, railways, petroleum, mechanical engineering and communications, by electricians and inspectors. Key advantages - Fast measurements: 5 seconds to measure grounding resistance, 2 seconds to measure earth voltage, enabling quick safety verification. - Safe operation: double protection safety design with overload protection; withstands 300 V AC for one minute and 200 V AC for a short duration to help ensure reliable and safe measurements. - Flexible settings: three gear positions to meet different measurement requirements, making testing more intelligent and convenient. Practical applications - On-site grounding verification for electrical installations to ensure compliance and safety. - Maintenance and inspection of grounding networks in railways, petroleum facilities, and petrochemical plants. - Routine earth-resistance and earth-voltage checks for equipment in industrial plants and communications infrastructure. Note: Specifications and features are kept consistent with the model DY4100 and its intended professional use.