72mm*72mm box shape LED digital display indicator voltmeter type : N-72V 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 compatibility range : 50-60 HZ display resolution : 1V sample rate : about 1time/s no input circuit power loss : display 000 Notice:Can not used in the electric environment with frequency conversion , high frequency, strong harmonic interference signal. If you are interested in our products, please contact us ,we will reply you as soon as possible.