GV13T is one light and low price-orientated module used for checking and demonstrating Voltage, Frequency and accumulating time of generator. This module can replace old meters, for it can be one with multi-functions. It uses normal screw for connection which is more convenient for installation. Voltage, frequency and accumulating time can be checked and demonstrated in the mean time; Results shown by 4-position digital LED tube Self-recycling of parameters with Page Turning Buttons Extra working power is not needed Parameter demonstration: Phase voltage Frequency Accumulating time Working power: AC 70~380 V Consuming power:MAX:1 W Recycling time: Voltage:5S, Frequency:5S, Accumulating time: 2S Temperature: -20 ~ 75 Size (W * H * D):58mm x 54mm x 41mm Installation Size(W * H): 47mm x 37mm Weight:50G Colour:black Material:ABS Package Contents: 1 x Frequency Test Hour Meter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.