The battery internal resistance tester can measure internal resistance and voltage of the battery at the same time. The Kelvin four-wire test clamp is adapted in order to better avoid the influence of contact resistance and wire resistance, and more accurate measurement can be performed This product adopts intelligent contrl, liquid crystal display, and simultaneous insertion of Kalman flter mathematical algorithm, which has the advantages of high precision, high eficiency, low cost, light weight, energy saving and environmental protection. Android mobile phone charger can be used, which is very convenient. This product is widely used in various battery production, maintenance, testing, scientific research laboratories and other occasions.It can also be used to measure AC resistance of capacitors and resistors with low resistance and high precision. Net quantity: 300g Color: black yellow material: plastic Quantity: 1set Packing list: 1*car battery tester Only the above package contents are included, other products are not included. Note: Reflection of light and different monitors may cause the item's color to be slightly different from the actual item. Measurements allow +/- 1-3 cm.