Overview 

The Autool BT280 Car Circuit Tester is an advanced diagnostic tool designed for 9–30V automotive electrical systems. It integrates multiple functions into a single unit, including multimeter readings, oscilloscope waveform analysis, relay and injector testing, component activation, polarity checking, and adjustable 0–5V output testing. Its 2.4-inch TFT color screen provides clear visibility and automatically displays voltage, resistance, and waveform data in real time. The tester supports four pulse modes for fuel injector diagnostics and can activate both 4-pin and 5-pin automotive relays. It features built-in overload protection with a fuse, audible voltage threshold alerts, and supports multiple languages for ease of use. Powered directly from the vehicle’s battery, the BT280 is ideal for professionals and DIY users who need an all-in-one tool for accurate and efficient electrical troubleshooting.

Features 

• Designed for 9–30V automotive electrical systems

• Combines multimeter, oscilloscope, relay tester, injector tester, and more

• 2.4-inch TFT color display for real-time voltage, resistance, and waveform data

• Supports four pulse modes for fuel injector testing

• Activates both 4-pin and 5-pin automotive relays

• Adjustable 0–5V output for testing components with custom voltage

• Polarity checking and component activation features

• Built-in fuse for overload protection and safety

• Audible alerts for over-voltage and under-voltage conditions

• Supports multiple languages for global usability

• Powered directly from the vehicle battery—no external power required

• Ideal for professionals and advanced DIY automotive diagnostics