Connect the battery test port to the positive and negative terminals of your car battery, start the tester, and select the "Battery Health Check" function. The tool will display the cold cranking amps and health status of the battery, helping you determine if the battery needs replacing.

Yes, the FLUTREE diagnostic tool is compatible with all vehicles that support OBD-II protocols, covering over 97% of vehicle models, including major car brands from the United States, Europe, and Asia.

Select the "Voltage Test" mode, connect the test probes to the positive and negative terminals of the circuit, and the screen will display the real-time voltage value, helping you quickly diagnose whether the circuit is functioning normally.

If you encounter any issues, you can contact our customer service team via our website. We offer online support or troubleshooting guidance. All products come with a one-year warranty.

Our products are usually shipped within 72 hours after order confirmation. Shipping times vary depending on the destination. Within the U.S., it typically takes 5-7 business days, and international shipping may take 7-15 business days.

Yes, you can request a refund within 30 days of purchase. The product must be unused and in its original packaging. Refunds will be processed within 5 business days after receiving the returned item and confirming no damage.

If the product has a quality issue, you can request an exchange within 30 days of receiving the product. Please contact customer service with your proof of purchase and a description of the issue, and we will assist with the exchange.

If your package is lost or damaged during transit, please contact our customer service team promptly with the relevant details. We will provide a solution, including reshipping the product or issuing a refund.

We support multiple payment methods, including credit cards, debit cards, PayPal, and other major payment platforms. All payment methods are processed securely with encryption.