Wireless voltmeter ammeter with Ah

Hey guys, I'm interested in real time Ah. I tried one of those generic Turnigy watt meters but the display is defective as it doesn't display anything when my 48v battery is near full charge. I just noticed this wireless voltmeter ammeter http://www.ebay.com/itm/252368209895?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT Does anyone have one, or any opinion about it? Looks like they also have a remote version with a USB to the display. Thanks

Hi. this one have one way Ah reading (only discharge, or only charge) . On eBay is two way version too. Mine works on 60v OK and on 90v blown :-(. Sun readablility isn't good. Now i have this better solution(i think) http://s.aliexpress.com/j2EbeQZ7 but untested for now.

Thanks sjejky. The Aliexpress one looks interesting too, but since I have a 48v battery, I think I will try the ebay one.

I tried a wired version of one of these volt/ amp meters. The only thing I would say is the LED display is difficult to read in direct sunlight. LCD displays are better for viewing in daylight.