sunkko t686h battery testerT 686H Lithium Battery Microresistance Measuring Instrument Features It is controlled by a microchip and the test data is accurately displayed. It has a dual digit display function and can measure the highest resolution value of 0. 1 0. 1mv. High precision achieved by measuring fine data. Automatic multi unit switching, a wide range of measurement requirements. The balanced input Kelvin four wire measuring probe has a high anti interference structure.