Detailed Product Description LED Frequency Meter1. Model: JY-LED96-3 JY-LDE72-3Fastening:by means of nuts ,absolutely safe,fast,robust,side by side. 2. Accuracy: Class 1.5.3. Voltage: 110V,220V,380V.Frequency: 45~55Hz, 45~65Hz, 55~65Hz, 47~53Hz, 57~63Hz, 44~56Hz,54~66Hz.5. Case: Non-combustile ABS plastic material is used for making JY series'external case,and PPO plastic material is used for JY ...