Features: Adopt 4-wire method which helps to 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 inst ent with 0-999m. accuracy: 1%. With beautiful apperance, small size, portable, you can put in your pocket wherever you go. Please note: the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! Applicable for measurement of internal resistances of Lithium-ion, alkaline, photovoltaic inverter, battery production line,etc. Color: As shown Material: plastic Package Contents: 1 x Battery Internal Resistance Test Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.