Watt meter 10KW

[json14j]

I use SSVR's to control the input to my elements. Because I vary the voltage to control heating its important for me to know at a glance what level of power I'm heating with. I have Volt and Amp meters for each element and a set for the whole system...but I want a digital meter. Yes I could just multiply A x V = Watts but I want a digital meter. Spent hours on google and ebay but I dont see what im looking for..a single display of watts...nothng else...not a multi function gadget...just watts. Anybody seen one or built one using Arduino etc?

 

[WPStrassburg]

http://www.ebay.com/itm/Digital-AC-...584?pt=LH_DefaultDomain_0&hash=item4613cbd6a8

https://www.homebrewtalk.com/f170/panel-power-meter-281561/

Not mine, but been done before.