Unverified80% confidenceDecision RuleTime unknown
计量精度需看是否通过国家1级或2级计量认证，标称精度±1%的产品用于电费核算可信，无认证的廉价插座计量误差可达±5%以上，长期累计电量偏差大
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80%
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Long-term
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Unverified能耗监测精度分档：普通计量款仅显示实时功率±5%，需精确计费应选带电流校准的高精度型号，误差可控制在±1%以内90% similarUnverified测量精度等级看有功电能计量准确度，家用监测选1级（误差±1%）足够；若需用于分摊电费或商业结算，应选0.5级或符合IEC 62053认证的产品89% similarUnverified监测精度看误差等级：普通计量插座误差约±2%~±5%，若用于电费核算或验证空调等大功率电器实际能耗，应选标注误差≤±1%的产品（1级精度）86% similarUnverified计量精度选1级（误差±1%）足够家用与自用监测；0.5S级（±0.5%）仅在需要精确分时结算或大功率商业计费时才有意义，价格显著更高86% similarUnverified测量精度看等级标识：Class 1.0（±1%误差）适合家庭算电费；Class 0.5及以上用于设备能效评测。低价产品若不标精度等级，误差可能达±5%以上，长期累计电量偏差明显86% similar
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