Manfiter Car Battery Tester & Alternator Tester for 12v, Test Battery Condition & Alternator Charging (LED Indication);

Size:LED Clamp
*LED display indicates condition 
*Check before Charge: Battery is alive, "OK" to be charged. 
*Alternator check : accelerate your engine to 2000 rpm when the green light is lit ,charging circuit is ok.
  *Battery check: indicate the percentage charging in the battery. 
*Cranking check : red light indicates voltage from Alternator over-high.