2026 VDIAGTOOL V500PRO 12V/24V Automotive Circuit Tester Car Power Circuit Probe Kit Multimeter Oscilloscope Relay Injector Test

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At VDIAGTOOL, we empower mechanics and car enthusiasts with high-precision, professional-grade diagnostic tools at competitive prices！

The VDIAGTOOL V500PRO is an all-in-one automotive circuit tester that combines a power probe, multimeter, oscilloscope, and short/open circuit finder into one kit.

It supports comprehensive tests including AC/DC voltage, resistance, current, frequency, relay/fuel injector testing, component activation, and wire tracing, with a 0–5V adjustable power supply for safe sensor debugging.

The 90° rotating screen ensures clear visibility in tight spaces, while mode II enables instant locating of open circuits, shorts, and broken wires across cars, trucks, boats, and RVs.

Backed by a 3-year warranty and 60-day return policy, this tool eliminates the need for multiple devices, saving time and money for both professional technicians and DIY enthusiasts tackling electrical repairs.

✅️Multimeter Mode (Voltage, Resistance, Diode, Current, Frequency)

The V500PRO functions as a full-featured multimeter, measuring voltage (2mV–100V)and diode status. This allows you to evaluate battery health, sensor performance, and circuit integrity, helping to pinpoint faults in critical components like alternators, sensors, and control modules.

✅️Smart Test

The smart test mode automatically identifies circuit conditions (voltage, resistance, short/open) and provides real-time analysis, eliminating manual mode switching and reducing human error. This feature speeds up diagnostics by guiding you to the root cause of electrical issues instantly.

Visualize real-time electrical signals with the built-in oscilloscope, which displays voltage waveforms (Y-axis) and time (X-axis). This helps diagnose intermittent sensor issues, signal interference, and component behavior that traditional multimeters miss—critical for advanced fault isolation.

Test 4-pin and 5-pin relays directly to verify coil resistance, contact switching, and overall functionality. This ensures relays operate safely under load, preventing electrical failures in lights, fans, and fuel systems, and reducing costly downtime.

The 0–5V adjustable power supply provides a stable, low-voltage output for safe testing of sensors, LEDs, and electronic modules. It protects sensitive components from burnout while simulating sensor inputs to debug circuits and confirm component behavior.

Activate components like cooling fans, window motors, and windshield wipers directly from the tool to confirm functionality. This helps diagnose faulty parts without disassembly, reducing repair time and unnecessary part replacements.

Output custom pulse signals to fuel injectors to check spray patterns and operational status. This feature diagnoses clogging, leakage, or misfiring, helping you avoid costly garage visits for injector diagnostics.

Switch to mode II to use the integrated breaker finder, which locates short circuits, open wires, and hidden breaks in wiring harnesses using tone and LED alerts. It traces wires without damaging insulation, making it ideal for troubleshooting electrical issues in cars, trucks, boats, and RVs.

Works on 9–30V DC systems, covering 12V cars, 24V trucks, motorcycles, and marine vessels. It measures voltage (0.1V–100V), resistance (0–10MΩ), and current (2mA–25A), making it versatile for any electrical repair scenario.

The 90° foldable color LCD screen ensures clear visibility in tight spaces, while built-in reverse polarity and overvoltage protection safeguard the tool and vehicle. A bright LED flashlight illuminates dark work areas for 24/7 diagnostics.

Supports English, Chinese, French, Spanish, German, Russian, Italian, Portuguese, and Polish, eliminating language barriers for global users.

Enjoy online updates, a 2-year warranty, and 24/7 technical support, ensuring your tool stays reliable and future-ready for all repair needs.

🏆 VDIAGTOOL V500pro Advanced Automotive Tester with Illuminated Foldable Display

✅️High-Brightness LED Searchlight

Integrated powerful LED lights illuminate dark engine bays and under-dash work areas, ensuring you can see components and connections clearly in any low-light environment.

✅️ 90° Foldable Screen

The innovative screen can be tilted up to 90 degrees, allowing you to view real-time diagnostic data from any angle—perfect for working in tight, cramped spaces or at awkward angles where a fixed screen would be unusable.

🏆 VDIAGTOOL V500pro High-Efficiency Automotive Multimeter with Comprehensive Measurement Capabilities

✅️Full Multimeter Functionality

High-efficiency measurement of essential electrical parameters including voltage (VDC), resistance (OHM), diode test (DIO), current (AMP), and frequency (HZ).

✅️Real-Time Data Display

Clear digital readout with live values (e.g., 12.2V, 518.8 OHM) and polarity indication for accurate troubleshooting.

✅️Max/Min Recording

Track voltage fluctuations with Max/Min value recording (e.g., Max: 12.22V, Min: 0.00V) to identify intermittent electrical problems.

✅️Smart Testing Guidance

Visual prompts guide proper probe connection and testing procedures with intuitive indicators like "[DOWN] green on" for correct operation.

✅️Wide Measurement Range

Versatile enough to handle everything from simple continuity tests to complex frequency measurements (e.g., 100 Hz) on automotive systems.

🏆 VDIAGTOOL V500pro Automotive Relay Diagnostic Tool - Intelligent Relay Testing for 4 & 5 Terminal Relays

✅️Dedicated Relay Test Mode

Quickly and accurately verify the functionality of both 4-terminal and 5-terminal relays without complex wiring or guesswork.

✅️Automatic Relay Diagnosis

Intelligently tests relay operation including coil activation, contact switching, and overall electrical performance.

✅️Real-Time Voltage Display

Features live voltage reading (e.g., 12.2V) to ensure proper operating voltage during testing.

✅️Simplified Fault Finding

Instantly identify faulty relays that cause electrical failures in lights, fans, fuel pumps, and other critical vehicle systems.

✅️Universal Compatibility

Supports testing of various relay types commonly used in automotive, truck, and marine electrical systems.

🏆 VDIAGTOOL V500pro Integrated Automotive Oscilloscope for Advanced Signal Analysis

✅️Built-In Oscilloscope Function

Visualize electrical signals in real-time with a dedicated oscilloscope mode, displaying voltage on the Y-axis (0.0V to 10.0V) and time on the X-axis (1ms to 500ms).

✅️Critical Signal Measurements

Accurately measure and analyze key waveform parameters including voltage (DIV/Max/Min), pulse width, frequency, and duty cycle.

✅️Professional Diagnostic Capability

Essential for diagnosing complex issues with sensors, actuators, ignition systems, and communication buses that traditional multimeters cannot capture.

✅️Pause Function for Analysis

Freeze the waveform on the screen for detailed inspection and precise measurement of intermittent electrical signals.

🏆 VDIAGTOOL V500pro Diagnostic Tool - Precision 0-5V Power Supply with Safety Protection

✅️Adjustable Low-Voltage Power Supply

Actively generate and adjust a stable voltage output from 0-5V for precise electrical testing and simulation.

✅️Built-In Current Limitation

Features automatic current limiting up to 100mA, providing essential protection for sensitive electronic components during testing.

✅️Safe Component Testing

Designed specifically to prevent burnout of delicate automotive sensors and circuits while allowing accurate voltage application.

✅️Active Mode Operation

Unlike simple passive testing, this function provides a controlled power source for verifying component behavior under specific voltage conditions.

🏆VDIAGTOOL V500pro Professional Mechanic Tester - Master Automotive Electrical Diagnostics & Component Activation

✅️All-in-One Diagnostic Tool

Functions as a circuit probe tester, multimeter, and oscilloscope for comprehensive electrical diagnostics.

✅️Direct Component Activation

Test and activate key vehicle components including lights, fuel injectors, windshield wipers, motors, radiator fans, and air conditioning fans.

✅️Easy Fault Identification

Quickly diagnose electrical issues by manually activating components to verify their functionality.

✅️Professional-Grade Performance

Designed for mechanics and automotive enthusiasts to accurately test and troubleshoot electrical systems.

✅️User-Friendly Interface

Simple operation with clear labeling for efficient component testing.

🏆 VDIAGTOOL V500pro Professional Tester - Advanced Fuel Injector Pulse Testing & Analysis

✅️Precision Pulse Signal Testing

Outputs specific pulse signals to fuel injectors to accurately check spraying performance and operational status.

✅️Multiple Test Modes

Supports various injector test patterns including:

• Continuous pulse testing
(e.g., 250ms '+')

• Complex pulse sequences
(e.g., 1.4S - 7ms '+' followed by 20ms pause)

• Alternating polarity testing
(e.g., 4ms '+' then 10ms '-')

• Repetitive cycle testing
(e.g., 7ms '+' then 20ms '-')

✅️Real-Time Status Monitoring

Clear visual feedback shows injector status with [OK] confirmation or [ESC] stop function for immediate fault identification.

✅️Multi-Channel Support

Capable of testing multiple injectors (M1, M2, M3, M4) simultaneously or individually for comprehensive fuel system diagnosis.

✅️Professional Diagnostic Tool

Essential for identifying clogged, leaking, or malfunctioning injectors that affect engine performance and fuel economy.

🏆 VDIAGTOOL V500pro Circuit Tester - Professional Short & Open Circuit Locator with Wire Tracing

✅️Advanced Short Circuit Detection

Quickly and accurately identify short circuits in vehicle wiring systems, preventing potential electrical damage and blown fuses.

✅️Precise Open Circuit Locating

Easily find breaks, disconnections, and faulty wiring that interrupt electrical flow in automotive circuits.

✅️Effortless Wire Tracing

Trace and identify specific wires through harnesses, panels, and conduits without damaging insulation, saving valuable diagnostic time.

🏆 VDIAGTOOL V500PRO Universal Electrical Diagnostics Tool Support Detection of Multiple Vehicle Models

✅️Universal Voltage Compatibility

Troubleshoot electrical systems across the entire 6-24V spectrum, making it the ultimate tool for virtually any vehicle or equipment.

✅️Multi-Vehicle Application

Extends beyond cars to diagnose electrical issues in ✔ trucks, ✔ buses, ✔ motorcycles, ✔ SUVs, ✔ ships, and marine applications.

✅️Comprehensive System Diagnostics

From complex car ECUs to basic motorcycle wiring, from truck lighting systems to marine batteries, tackle all 6-24V electrical issues with one tool.

✅️All-In-One Versatility

Combines circuit testing, component activation, and wire tracing functions essential for maintaining any fleet or vehicle type.

✅️Professional Grade Reliability

Built to handle diverse diagnostic scenarios, from auto repair shops to marine mechanics and fleet maintenance facilities.

🏆 VDIAGTOOL V500PRO Circuit Probe Tester Packing List

✅️V500Pro circuit probe tester x1

✅️V500Pro short open circuit finderx1

✅️Probe tip x1

✅️Fine probe tipx1

✅️Probe tip extension cable x1

✅️Wire piercing probe x2

✅️Banana to banana plug test lead x2

✅️Fuse x3

✅️Relay test cable x1

✅️Alligator batterry clip x1

✅️Type-C data cable x1

✅️User's manual x1

✅️Banana plug to alligator clip x1