GF302D1 meets IEC, ANSI and China JJG/DLT global metering standards with CE & CNAS certification. Available in 0.02%/0.05%/0.1% accuracy grades, stable output ≤0.01%/120s and waveform distortion under 0.3%. It covers full wiring types from 1P2W to 3P4W, ideal for official metrology institute periodic verification and factory meter quality inspection. Wide ambient range -10℃~+50℃ adapts complicated lab & outdoor calibration environment.
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