LED Frequency Meter Model:SF-LED96-3,SF- ... ,220V,380V Frequency:45~55Hz,45~65Hz...54~66Hz LED Frequency Meter1. Model: SF-LED96-3 SF-LDE72 ... ~53Hz, 57~63Hz, 44~56Hz,54~66Hz.5. Case: Non-combustile ABS plastic material is used for making ... SF series'external case,and PPO plastic material is used for SF ... have further enquiry, welcome to contact us. LED Frequency Meter