EC-2V - Two Channel Voltage Logger

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The EC-2V is used to record voltage on two channels, Live (Hot) with respect to Neutral and Earth (Ground) wrt Neutral, if you suspect Earth/Grounding issues then the EC-2V would tell you if the local Neutral is developing a voltage wrt the local Earth. Voltage optimisation companies also use the product to monitor voltage levels pre and post optimisation. Many power distribution companies use the product to highlight real voltage problems.

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Voltage recorder enables real voltage problems to be high lighted live to 
neutral and earth/ground to neutral
Data stored in non-volatile memory
Memory capacity of 32,000 (True RMS) values per channel (10bit), up to 
300 days continuous recording
Selectable averaging period from 1 second to 60 minutes
Voltage accurate to 1% of reading + 1 Volt (90Vac - 260Vac)
Kit includes data logger, voltage lead, USB lead, Electrosoft software and 
carry case