● The BT-100D 100+ Amp Digital Battery Load Tester is microprocessor controlled. It makes for an easy and accurate load test with no need to time yourself to get accurate results. Bright, LED Digital Display indicates both voltage and test results. A unique 3-Step Design provides LED polarity check function, battery load test and charging system test readout. Automatically Turns Off the Load after 10 seconds and locks the voltage. Super-Grip Battery Clamps are heavy-duty and color-coded. Baked Enamel, Steel Case to keep cool. Rubber Insulated Carrying Handle–for comfort and safety. Checks both Battery and Charging System.