Dual Pro Lithium Battery Gauge - Single - Rectangle Horizontal Display [BFGHLITH]Lithium Battery Gauge Single Rectangle Horizontal Display The most advanced and reliable battery gauge on the market! Each Lithium Battery Gauge includes a Current Transducer (CT). What does this mean for you? Accurate real time state of charge reading. Typical gauges cannot precisely detect lithium battery levels as they charge discharge. The CT allows the gauge to accurately track amp hours in and amp hours out. PROView Link is a mobile app that