Description
JDiag • OBD2 automotive diagnostic tool T300PRO
The JDiag T300PRO is a moderate-complexity diagnostic tool blending an OBD2 scanner and 12V/24V battery tester into a single device, built for automotive service professionals and serious enthusiasts. The instrument features a 2.8-inch high-brightness TFT screen, rugged ABS housing, and supports battery standards like lead-acid, AGM, GEL, EFB across 10–300 Ah and 20–2000 CCA. Offers full OBDII diagnostic coverage on approximately 97% of compatible vehicles with functions such as trouble code reading, real-time data streaming, emissions readiness, EVAP component testing, and a built-in code library in multiple languages. Compact for workshop use; plug the device into your OBDII port and begin diagnostics immediately.
Key benefits
- Wide battery test range: 12V/24V systems; 10-300 Ah and 20-2000 CCA covering lead-acid, AGM, GEL, EFB standards
- Extensive OBDII scan capabilities: read/clear fault codes, real-time data, freeze frame, I/M readiness, O₂ sensor, and EVAP system tests
- Easy-use interface: 2.8-inch color screen, built-in DTC lookup, multilingual menus, cloud report printing via QR code
- Durable build for workshop environments: rugged housing, broad temperature tolerance of -20 to 60 °C
- Universal vehicle compatibility: works with passenger cars, trucks, motorcycles with OBDII ports (≈97% of vehicles)
Supported protocols
- ISO 9141-2
- KWP2000 (5-baud and fast init)
- SAE J1850 PWM & SAE J1850 VPW
- ISO 14230-4 (KWP fast & 5-baud init)
- ISO 15765-4 CAN (11- & 29-bit IDs at 250 & 500 kb/s)
Supported functions
Depending on vehicle compatibility, the following functions are supported:
- Reads diagnostic trouble codes (DTCs), clear DTCs
- Real-time sensor data stream
- I/M readiness (emissions monitor status)
- ECU information like VIN, calibration IDs
- Freezes frame snapshot when fault occurs
- O₂ sensor test and EVAP component test
- Battery diagnostics: state of health, state of charge, charging test, start/cranking test, load test, voltage waveform monitoring
Included items
- 1 × scanner unit (T300PRO OBD2 scanner & battery tester)
- 1 × OBDII connector cable
- 1 × battery clamp cable
- 1 × USB cable
- 1 × user manual
Supported languages
English, Spanish, French, Italian, Russian, Portuguese, German, Polish, Dutch, Japanese, Turkish, Indonesian, Thai, Chinese

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