... cover material,PC, Plasticelectric three-phase pre-paid meter(electronic meter electric three-phase pre-paid meter(electronic meter ,watt-hour meer ,prepayment electronic meter,meter ) TechnicalindesProductmanufacture standard:Conforms ... condition:Temperature range-20 +50Relative humidity ≤85% electric three-phase pre-paid meter(electronic meter ,watt-hour meter ,prepayment electronic meter,meter )