About this item

【Smart Auto-Detection】The OBDResource CP03 Circuit Tester features fully automatic signal recognition technology. In default mode, it automatically detects DC voltage, polarity, resistance, and continuity status without manual mode switching. The data hold function locks screen readings with a single button, simplifying operation and boosting testing efficiency.
【Wide Range High-Precision Measurement】Supports DC voltage detection from 0.8V to 100V and resistance testing from 1Ω to 20MΩ, with a resolution up to 0.001V and accuracy of ±1%. Automatically identifies battery polarity, clearly indicating the negative terminal with a “-” symbol to prevent misconnection. Suitable for automotive circuits, fuses, battery systems, and various other scenarios.
【Safety Protection & Real-Time Alerts】Features an intelligent audible alert function. Automatically alarms when resistance drops below 50Ω and displays “OL” on screen when voltage exceeds 100V. Equipped with a long spring-loaded negative terminal clip and probe protective cap, featuring short-circuit prevention design for both operational safety and convenient storage.
【User-Friendly Design】Includes a backlit LCD screen and flashlight function. Short press to toggle backlight; long press to activate illumination, ensuring clear readings in low-light conditions. Auto-shuts off after 15 minutes of inactivity for energy efficiency. Comes with a portable storage pouch for easy daily carry and storage.
【Multi-Scene Compatibility】Covers all automotive circuit diagnostics scenarios, from basic continuity testing to complex system troubleshooting, serving both home DIY and professional repair needs. Intuitive symbol displays and audible feedback significantly lower the learning curve, making it an efficient automotive maintenance assistant.