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

VDIAGTOOL V500PRO is a professional 12V/24V automotive circuit tester and car power circuit probe kit.

This all-in-one circuit probe tester integrates car multimeter, automotive oscilloscope, relay test, fuel injector test, component activation, short circuit test and open circuit test, making it the best automotive electrical tool for cars, trucks, boats and RVs.

🏆 VDIAGTOOL V500PRO — 2 Tools in 1 Smart Power Circuit Probe Tester

Save $1000+ on Professional Equipment

Tired of juggling multiple tools for electrical diagnostics?

The V500PRO combines a smart power probe, multimeter, oscilloscope, and short/open circuit finder into one kit, making it the ultimate all-in-one solution for automotive electrical repairs.

✅ Car Multimeter Mode

Measures AC/DC voltage (2mV–100V), resistance, current, frequency, and diodes — evaluate battery health, sensor performance, and circuit integrity in one go.

✅ Smart Auto Test

Automatically identifies circuit conditions (voltage, resistance, short/open) with real-time analysis, eliminating manual mode switching and human error.

✅Built-In Automotive Oscilloscope

Visualize real-time voltage waveforms to diagnose intermittent sensor issues, signal interference, and component behavior that traditional multimeters miss.

✅ Relay & Fuel Injector Test

- Test 4/5-pin relays to verify coil resistance and contact switching.

- Output custom pulse signals to check injector spray patterns and operational status, avoiding costly garage visits.

✅ 0–5V Adjustable Power Supply

Stable low-voltage output for safe sensor/LED testing, with built-in current limiting (100mA) to protect sensitive components.

✅Automotive Component Activation

Directly activate fans, motors, wipers, and lights to confirm functionality — no disassembly needed, reducing repair time.

✅ Short Circuit Test/Open Circuit Test (Mode II)(Mode II)

Locate shorts, open wires, and hidden breaks with tone/LED alerts, tracing wires without damaging insulation.

✅ User-Friendly Design

- 90° foldable color LCD screen: clear visibility in tight spaces.

- High-brightness LED flashlight: illuminate dark engine bays.

- Reverse polarity/overvoltage protection: safe for tool and vehicle.

✅ Wide Compatibility

Works on 9–30V DC systems: 12V cars, 24V trucks, motorcycles, boats, and RVs. Supports 9 languages (English, Spanish, French, etc.) for global users.

✅ Reliable After-Sales

2-year warranty + 60-day return policy + 24/7 technical support + lifetime online updates — your tool stays reliable and future-ready.

👉 Perfect for professional technicians and DIY enthusiasts tackling electrical repair!

🏆 VDIAGTOOL V500PRO Automotive Circuit Tester— Llluminated 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 main screen of V500 PRO circuit diagnostic tool can be rotated 90°, 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 Car Power Circuit Probe — Smart Test & Multimeter

✅️ Smart Test

Different from traditional power circuit testers, the 2025 VDIAGTOOL V500PRO 2 IN 1 Automotive Power Circuit Probe Breaker Finder can automatically identify the signals under test, such as voltage, current, resistance and other parameters in the circuit, and save switching time between different test modes , allowing customers to focus on repairing circuit faults.

✅️Multimeter mode

The car multimeter various voltage signals with four features: Voltage (VDC), Resistance(OHM), Diode (DIO), Current (AMP), Frequency (HZ), and Polarity.

Automotive Multimeter mainly used to measure basic parameters such as voltage, current, resistance, etc. in the circuit, and has a wide measurement range.

→Voltage Test：0.1-100V;

→Resistance Test: 0KR-200KR;

→Current Test：2mA-25A;

→Frequency Test: 10Hz-1MHZ;

→Oscilloscope:10Hz-100KHZ.

This car multimeter function makes the V500PRO the most versatile automotive circuit tester for daily electrical diagnosis.

🏆VDIAGTOOL V500 PRO Circuit Probe Tester — Relay Test

Relay testing is the process of checking the function and performance of a relay to ensure that it works properly in the circuit.

By testing the relay's coil voltage, resistance, contact status, etc., it is possible to diagnose whether the relay is damaged or failed, which is crucial to maintaining the reliability and safety of the electrical system.Common relay tests include:

→Voltage test;

→ Coil resistance test;

→Relay action test;

→Relay delay and retention test.

🏆 VDIAGTOOL V500 PRO Automotive Circuit Tester — Oscilloscope Function

1、Parameter range

→Frequency Measurement Range: 10Hz-1000Khz

→Waveform display: 10Hz-100Khz

2、Oscilloscope Function

✅️Visual fault diagnosis:

The oscilloscope mode visualizes the signal and intuitively displays the change of the signal shape, which makes it convenient for customers to quickly identify abnormal behavior in the circuit, such as waveform distortion, signal attenuation and other problems;

✅️Detect transient problems

Transient problems in the circuit (such as instantaneous voltage spikes, pulse interference, etc.) are sometimes not captured by static measurement tools (such as multimeters). The oscilloscope can display these transient signals in real time, which helps to find transient faults, such as power supply fluctuations or unstable signals;

✅️Frequency analysis

The oscilloscope can not only display the waveform of voltage or current, but also help users measure the frequency, period and other characteristics of the signal. This is very useful for debugging and optimizing oscillation circuits, clock circuits or wireless communication circuits, helping customers accurately diagnose the frequency characteristics of the circuit;

✅️Capture repetitive faults

For periodic faults, the oscilloscope can find the problem by capturing and analyzing the periodic changes of the signal. For example, users can see if there is repeated noise interference or signal interruption, which helps to accurately locate the cause of the fault.

The built-in automotive oscilloscope makes this circuit probe tester more professional than common multimeters.

🏆 VDIAGTOOL V500 PRO Automotive Circuit Tester — 0-5V POWER SUPPLY

0-5V Power Supply provides a stable and adjustable low-voltage power supply for customers' circuit diagnosis. It can simulate input voltage, debug sensors, test circuit behavior, and calibrate systems.

→Sensors: oxygen sensors, temperature sensors, pressure sensors, etc.;

→Motor drive modules: electric windows, electric seats, etc.;

→On-board communication modules: CAN bus interface and other low-power communication modules;

→Relays and switches: lights, fans and audio systems;

→LED indicators: engine fault lights, oil pressure warning lights, etc.

✅️️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.

🏆VDIAGTOOL V500 PRO Circuit Probe Tester — Component Activation

Automotive component activation is mainly used in circuit testers to confirm and test the function and status of each component in the circuit. By activating different components, users can quickly identify faults and ensure the normal operation of the circuit.

✅️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 V500 PRO Circuit Probe Tester — Injector Test

✅️Precision Pulse Signal Testing

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

✅️Multiple Test Modes

→Mode 1: One 250 millisecond positive electrode;

→ Mode 2: Cycle positive for 7 milliseconds, negative for 20 milliseconds in 1.4 seconds;

→ Mode 3: Cycle the positive electrode for 4 milliseconds and the negative electrode for 10 milliseconds in 1.4 seconds;

→Mode 4: Continuous output of positive pole for 7 milliseconds and negative pole for 20 milliseconds.

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

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

🏆VDIAGTOOL V500 PRO — Circuit Diagnostic Functions（Short Circuit Finder/Open Circuit Tester）

When VDIAGTOOL V500PRO 2 IN 1 Car Power Circuit Probe Open Short Finder switches to mode 2, it is equivalent to V210, with 2 test methods.

✅️Checking Short Circuit

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

✅Locating Open Circuit

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 Circuit Diagnostic 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

✔ trucks, ✔ buses, ✔ motorcycles, ✔ SUVs, ✔ ships

✅Wide measurement range

→Operating Voltage: 9V - 30V DC

→Voltage Measurement Range: 2mV-100V

→Resistance Measurement Range: 0-10MΩ

→Current Measurement Range: 2mA-25A

→Frequency Measurement Range: 10Hz-1000Khz

→Waveform display: 10Hz-100Khz

→ Operating Temp: 0℃-50℃/32°F-122°F

→Working Environment Temp: 0℃-50°C/-32°F-122°F

→Storage Temp: - 20°℃-70°C/-4°F-158°F

✅Supports 9 languages

English、Chinese、Russian、Spanish、German、French、Italian、Portuguese、Polish.

🏆 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

In summary, the VDIAGTOOL V500PRO is the ultimate automotive circuit tester and power circuit probe kit, combining car multimeter, automotive oscilloscope, relay test, fuel injector test, short/open circuit finder and component activation functions, perfect for professional technicians and DIY enthusiasts.