MoKasi&reg; SS400039 Multi-function Automobile Auto Circuit Tester Detector Multimeter + Lamp + Probe + Light Diagnostic Tool with Instruction Manual It can accurately detect various line faults under the situation of no damage to rubber cover, it is convenient to use, efficient to detect, easy to operate and has reliable performance. It sets multimeter & test lamp gear which has the functions that the top-level multimeter fails to do. It specially detects the wires with bad contact and aging wires. It can detect each fault in the place where the space is narrow and light is weak. The product is the only four-in-one product with the functions of multimeter, test lamp, lighting lamp and probe. All functions of digital multimeter are intelligent. Backlight is closed automatically after the backlight of 30s. All ranges are intelligent, and the instrument shuts off automatically after the stop of use for 20min.