Features: Adopt 4-wire method which helps to ensure the accuracy of the measured value. Digital LCD display, easy to read the measurement result. With backlight, it makes it easy to read in low light areas. True four line battery internal resistance instrument with 0-999mΩ. accuracy: ±1%. With beautiful apperance, small size, portable, you can put in your pocket wherever you go. Applicable for measurement of internal resistances of Lithium-ion, alkaline, photovoltaic inverter, battery production line,etc. Specifications: Material: Plastic Size: approx 156x36x63mm/6.1x1.4x2.5in Range: 0-999mΩ Package Includes: 1x Battery Internal Resistance Test note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.