Voltage, frequency and accumulating time can be checked and demonstrated in the mean time. Results shown by 4-position digital LED tube. -recycling of parameters. With page turning buttons. Extra working is not needed. GV05 is one light module used for checking and demonstrating voltage, current,,frequency and accumulating time of generator. This module can replace old meters, for it can with multiple functions. It uses normal screw for connection which is more convenient for installation. Supply: AC165~275V/ AC280~450V Consuming : max. 1 W Temperature: -40~75 Size (W*H*D):60mm x 33mm x 51mm Installation Size (W*H): 51mm x 26mm Range and Accuracy: AC voltage: phase voltage AC165-260V, line voltage AC300-450V; deviation less than equal 1% : 0~6Kw/0-10Kw/0-18Kw, deviation less than equal 2% Frequency: 45-70HZ, deviation less than equal 0.5% Accumulated time: 0-9999hours (min:0.1hours), deviation less than equal 1% Parameter Display: Phase voltage Current Frequency Run time Accumulating time Colour:Photo Color Material:plastic Package Contents: 1 x Digital Display Meter Only the above package content, other products are not included. Note: Light reflection and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.