CircuitPro Auto Tester

CircuitPro Auto Tester is a professional-grade automotive circuit and relay diagnostic probe designed for fast, accurate electrical troubleshooting on any 12V or 24V vehicle. With a digital voltage display, built-in relay testing function, positive and negative indicator lights, and shock-resistant construction, this all-in-one diagnostic tool delivers reliable circuit testing for professional mechanics and DIY auto repair enthusiasts alike.

Versatile 12V & 24V Compatibility One tester for every vehicle type and electrical system. Compatible with: • Cars and vans • Trucks and buses • Engineering machinery • 12V and 24V electrical systems

5-in-1 Electrical Diagnostic Functions Comprehensive circuit testing in one portable tool. Detects: • Voltage levels • Polarity testing • Continuity checking • Short circuit detection • Leakage detection

Built-In Relay Testing Function Quickly identify relay faults with ease. Features include: • Works with standard 4-pin and 5-pin relays • Identifies coil burnout faults • Detects contact sticking issues • Spots abnormal relay engagement

Digital Display & Indicator Lights Clear, instant visual feedback for every test. Features include: • Real-time digital voltage display • Red light — positive detection • Green light — negative and ground detection • No light — no voltage detected

Easy One-Click Operation Simple, professional-grade operation for any user. Features include: • One-click positive and negative output switch • Long extension cable included • Battery alligator clips included • Easy to operate for mechanics and DIYers

Shock-Resistant & Moisture-Proof Construction Built for tough workshop and field conditions. Features include: • Shock-resistant durable construction • Moisture-proof design • Stable performance from -20°C to +55°C • Portable handheld design for any job 

Diagnose Faster, Fix Smarter Whether you’re troubleshooting a faulty relay, checking circuit continuity, or diagnosing electrical faults on a truck or van, CircuitPro Auto Tester gives you the precision, versatility, and durability to identify and fix every electrical problem quickly and confidently.

Upgrade your auto repair toolkit with CircuitPro Auto Tester — the professional 12V/24V automotive diagnostic probe designed for comprehensive circuit testing, relay fault detection, and reliable electrical troubleshooting on any vehicle.