About this item

• 🚀 【 Upgraded with 3️⃣ Advanced Modes – Smarter Than Basic Power Circuit Probes 】 The KZYEE KM50 automotive circuit tester adds Frequency, Duty Cycle, and Fuel Injector testing to standard DC/AC Voltage, Resistance, and Diode checks, giving you 7️⃣ test modes in one tool. These extra modes let you analyze sensor signals, PWM outputs, and injector pulses like an oscilloscope, helping you detect weak sensors or irregular injections faster and more accurately.
• 【 Diagnose Faster – Trace Shorts and Bad Grounds in Minutes 】 KM50 turns complex electrical checks into a guided, time-saving process. Visual LEDs and buzzer alerts instantly show voltage, ground and continuity status, helping you locate shorts, opens and faulty grounds in minutes. This power diagnostic probe combines efficiency and accuracy, while the built-in auto-reset breaker protects both the vehicle and the tool—so you work faster and finish repairs right the first time.
• 【 Real-Time Waveform Display – See What Numbers Can’t Show 】 The TFT color display transforms hidden signals into live waveforms, revealing injector pulses, duty-cycle changes and voltage spikes as they happen. Adjustable sampling rate and dual waveform/digital modes provide clear, actionable data for precise circuit analysis. This power test probe tool gives you real-time waveform clarity that ordinary testers can’t, helping you diagnose smarter and fix faster like a professional automotive circuit tester.
• 【 Instant Component Activation – Know If It’s the Part or the Wire 】 Press the rocker switch to apply positive or negative current and power components instantly – lights, fans, motors or injectors. This power signal probe tester allows direct component activation to verify circuits without removing parts. No jumper leads, no disassembly, no guessing – just quick, reliable proof that saves time, money and unnecessary part swaps.
• 【 Auto-Reset Circuit Breaker – Safe for Modern ECU Systems 】Built for today’s computerized vehicles, the internal auto-reset breaker instantly cuts power during overload and resets automatically within a minute. The low-current (<100 mA) design protects sensitive ECUs, sensors and airbags. This power current probe tool lets you test circuits safely without risking damage – an essential feature for any automotive power circuit probe used on modern vehicles.
• 【 Smart Feedback Design – Visual, Audible and Practical 】 Red/green LEDs and tone alerts instantly indicate polarity and continuity. A built-in LED work light illuminates dark engine bays, and the ergonomic anti-slip grip ensures one-hand operation with comfort and control. Whether under a dashboard or beneath a truck, this power diagnostic probe tester keeps you focused on results, not on reading manuals – a must-have automotive diagnostic circuit tester for professionals and beginners alike.
• 【 Built Tough – Professional-Grade Durability and Precision 】 Encased in impact-resistant ABS plastic and reinforced with heavy-duty cables, KM50 is engineered for daily workshop use. Includes probe tip, ground lead, extension cable and battery clamp, all stored in a protective EVA hard case. A professional-grade heavy duty power circuit probe designed to perform reliably job after job and built to withstand years of demanding diagnostics.
• 【 Universal Compatibility – Cars, Trucks, RVs and Boats 】 Covering 8–30 V DC, this automotive power circuit probe tester works seamlessly on 12 V and 24 V systems across cars, diesel trucks, trailers and marine equipment. Wherever electricity flows, it helps you trace, test and repair circuits quickly – a portable, versatile power wire probe trusted by technicians and DIYers alike.