MULTIFUNCTIONAL CIRCUIT PROBE TESTER:The power circuit probe tester has multiple functions, such as detection Circuit Polarity, Voltage, Connection, Break, Lighting, Ignition Plug, Sensor Measurement, Grounding Test, Continuity Test, Component Activation and other functions. no extra battery needed. EASY TO READ: The circuit tester combines an LCD digital backlight display with an LED indicator light design, making it easier to read the voltage and current values of the screen and distinguish between positive and negative electrodes. ILLUMINATION FUNCTION: the test light probe built-in flashlight is bright enough to light up your work area. When the two alligator clamps respectively clamp the positive and negative ends of the battery, the flashlight immediately lights up, which is more convenient to test at night or in dark areas. EXTENDED SPRING WIRE & ANTI-LOST PROBE COVER: Compared with wire, the automotive light tester comes with high quality spring wire, making the maintenance and diagnosis work more portable, convenient and fast. In addition, the integrated design of the anti-loss cover ensures no puncture wounds, no matter where you go not be lost. 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.