Square 72Mm*72Mm Box Shape Led Frequency Meter type : N-72HZ place of origin : Zhejiang Province,China(Mainland) brand name : NIN mounting diameter : 72mm*72mm input voltage : AC 220V voltage measuring range : AC 50-500V frequency measuring range : 3-120 HZ accuracy : 2%± Hz display resolution : 1Hz sample rate : about 1time/s
