KZYEE KM50 Power Circuit Probe & Automotive Circuit Tester, Live Waveform

Our mission is to make complex diagnostics simpler, and faster—helping you fix with confidence and save both time and money. Discover the KZYEE KM50, turning complexity into mastery. Get real-time insights on voltage drops, signal, and component health — say goodbye to surface checks and missed faults. It’s designed for demanding workflows. Engineered with cutting-edge diagnostics and trusted by technicians and car owner, it outshines an entire workshop. Featuring 7 advanced modes, safe overload protection, 20ft reach, and a crisp color display, this pro-grade probe delivers the precision, speed, and reliability. Tackle any circuit challenge with championship-grade confidence. 7 Modes - DC/AC Voltage, Resistance, Continuity, Frequency, Duty Cycle & Fuel Injector Test. 20FT Cable, And With A Heavy Duty Case. Built for deeper automotive electrical testing, the KM50 combines everyday circuit checks with Frequency, Duty Cycle and Fuel Inject modes, live waveform display and component activation—all in one handheld tester. Seven test modes cover DC/AC Voltage, Frequency, Duty Cycle, Fuel Injection, Resistance and Diode, helping you check circuits and signals before replacing parts. Frequency, Duty Cycle and Fuel Inject modes help you examine signal timing and circuit behavior that basic voltage checks alone may not explain. Switch between digital readings and live waveform display to see how frequency, duty cycle and fuel injection signals change over time, helping reveal unstable or abnormal circuit behavior. Use the KM50 as a fuel injector circuit tester to view injection time, injector supply voltage, ground voltage, reverse induced voltage and control waveform before moving to wiring or component checks. Use continuity checks, polarity indication and ground testing to narrow down open circuits, shorts and poor ground connections before opening more of the harness. Use component activation to apply positive power or ground from the probe tip and check whether supported motors, lights and other electrical components respond before replacing parts. Apply power or ground from the probe tip to check whether supported lights respond, helping separate a component problem from a wiring or power-supply issue. Check voltage and circuit status around the fuse box to quickly rule out basic power-supply problems before moving deeper into the electrical system. Move from voltage, resistance and diode checks to Frequency, Duty Cycle and Fuel Injection testing—all in one handheld automotive circuit tester. The extended probe reaches connectors and test points in tight engine bays or behind panels, making electrical checks easier with less disassembly. LED lighting helps in dark work areas, while buzzer feedback gives quick audible confirmation during circuit checks. The handheld layout keeps the probe, display and controls together, so you can switch modes and test circuits without changing tools. The TFT color display keeps voltage, signal and waveform data easy to read, helping you review key information quickly during testing. Pierce wire insulation to check voltage or signals without disconnecting connectors. The included extension cable and long power cable provide added reach for different testing needs. Includes the probe, battery clamps, ground lead, extension cable and key testing accessories. Check common electrical and wiring problems on compatible cars, trucks, trailers and RVs. KM50 combines circuit testing, signal analysis and component checks in one handheld automotive electrical tester for DIYers and independent technicians. What can the KM50 test, and does it work with 12V/24V vehicles? KM50 supports 12V/24V vehicle electrical systems with 7 modes: DC/AC Voltage, Frequency, Duty Cycle, Fuel Inject, Resistance and Diode. It also checks continuity, polarity, short circuits, bad grounds and components. What can the KM50 Fuel Inject mode show? Fuel Inject mode shows injection time, injector supply voltage, ground voltage, reverse induced voltage and the control waveform in real time, helping you evaluate injector circuit behavior before deeper wiring or component checks. an the KM50 activate motors, lights and other electrical components? Yes. Component Activation can apply positive power or ground through the probe tip to check whether supported electrical components respond, helping you narrow down whether the issue is in the component or the circuit before replacing parts. Can the KM50 test sensor and signal circuits? Yes. KM50 supports signal circuit testing. Frequency and Duty Cycle modes can show digital data and live waveforms, helping you observe changing signals and identify abnormal circuit behavior beyond basic voltage checks. Is the KM50 easy to use in dark areas, and does it have overload protection? Yes. LED lighting helps illuminate dark work areas, while the TFT display, red/green LEDs and buzzer provide clear feedback. An internal circuit breaker trips during overload to help protect the tester.